Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f362c80e27462a…

MALICIOUS

PDF

90.9 KB Created: 2021-03-07 04:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8df9f8dee910f5567eaad4cce58de539 SHA-1: 962c570f7e5071f11031d509f4289e220f6700ec SHA-256: 50f362c80e27462a9f53f4f511600042cd9b57091c78f355a2ef1db38ca7a45e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/wix?keyword=lotro+minstrel+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370317/normal_600f1404f09b2.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/b2a4e7d68c7.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/1eadea7ffc46f5d.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/zolij-pofixin.pdfIn PDF document text
    • http://sravniproxy.info/why_walmart_failed_in_koreamqcfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_601bb62b7cf9b.pdfIn PDF document text
    • http://todayit.pro/maroon_long_sleeve_dress_formalnlst0.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/dFabT0o/camera_for_desktop_computer_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/jehi0ao/top_10_everything_2013_owasp.pdfIn PDF document text
    • https://cdn.sqhk.co/zenipijujate/ZjjrgxR/42085689176.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/is_fanatics_jerseys_legit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_601b4dd9a5b1c.pdfIn PDF document text
    • http://introdom.ru/engineering_geology_by_n_chennakesavulu_downloads55a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381766/normal_5ff03adf93d98.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/cuales_son_los_sintomas_cuando_se_le_baja_el_azucar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_588fbd29fe4441f693c247b3fa07fe38.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_5c36e78d2a3843fa9fec1c0d2191799b.pdf?index=trueIn PDF document text
    • http://jitawidavez.atwebpages.com/92413593748.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_d38ebab1c50c4212b0381a5d4c4739bd.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_180ae8f064cc4ac38d53a8871e1102c5.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/fallout_4_companion_guide_likes.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_d0651eb2566e4892800ee4b7673ea008.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 4820 bytes
SHA-256: 8fbded41941d0ce727d14fff6fbe7e067c3d3a662b1e3ba44dc32fef80d91883
font_01_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10804 bytes
SHA-256: 13467091605b20391904ee04314a8b3b543627985e48fea8502b22dc0d5e2313
font_02_sfnt_off00015040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15040 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f