Malicious PDF — malware analysis report

Static analysis result for SHA-256 3232cdd121b5102f…

MALICIOUS

PDF

120.3 KB Created: 2021-05-03 00:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b074ead5152df6e20ed57508052fcef8 SHA-1: 4664ffdef8986298e18753409a3efde254bd082a SHA-256: 3232cdd121b5102fed34f8fc9307b049a39d24c317488355c85a50b8652d1357
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple critical heuristics as a malicious redirector and a link farm, containing numerous links to external PDFs hosted on disposable domains. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to phishing sites or further malware downloads, masquerading as practice tests.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=sat+practice+test+3+answers+2019 In PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/76334359014930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6019a6f955d9a.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/5237010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_604ad19723e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_6035ad3c3a825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5fd82b6a5021b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_603846ca5dce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_60243ff4e2429.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/saxon_algebra_2_test_forms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_6064d005b04ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485016/normal_5ffed557263ff.pdfIn PDF document text
    • http://cleanup-sale.site/79976359141z8qvp.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/caisson_metod_ikea.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/case_study_research_design_and_methods_yin.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/1ed48c.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/are_log_home_kits_worth_it.pdfIn PDF document text
    • http://webmastervlad.ru/perception_of_academic_stress_scale_scoringd9o85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6044d09ff058f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_3f988a3361b74879ad059d6e6cab0034.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_35ab2b1e7b35465f826b31caa2dc768c.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_52eb0de348694f329b7d5057dadb2e22.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3f56222b1c4e43dc88f358098b2457bb.pdf?index=trueIn PDF document text
    • http://jinugiwi.atwebpages.com/12003587833.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_9ace36c73bd246968c818c595dbbdc3b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001572f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572F 4448 bytes
SHA-256: ffdd4f3faa5edf17f7e9c5ffc95acad763dd06d488f83c886c0d0c3dc7abc048
font_01_sfnt_off000166e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E0 5736 bytes
SHA-256: 40321dd5e2e45a7adf7c98758b051ba1640cec71c704e4809aeef60b0e4e1966
font_02_sfnt_off00017a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A84 14988 bytes
SHA-256: 7a27a796821594217286e4ebe0bf3ee0ff9e29abefe512b236f4ed57ef1c8ea1
font_03_sfnt_off0001ac24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC24 16732 bytes
SHA-256: 756804002fb62bef6d35c69088b4ee4805a8e8ef29fcd79211233ba8ce3536a9
font_04_sfnt_off0001c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C392 6116 bytes
SHA-256: 31a1867208975b7413879195950ecc4fd32e02f255f704b87a34dcd4d75edcad