Malicious PDF — malware analysis report

Static analysis result for SHA-256 760c3b1cb704532a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 05:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b4d25ca27bf4436d5492b8a1cca3ac6 SHA-1: b88191b5de3fb2d20550d08c922df679db1e8d11 SHA-256: 760c3b1cb704532a207e91dd89ac07db3c7aa982d62e7be7d74b5349fa77bfc1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=desktop+support+engineer+interview+questions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417990/normal_600beeb639749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_602efd5709ed4.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/55642652921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_60293be4cde9a.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/hbH4hfx/76313507817.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ggQhjaX/5187989587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_604d3866ed2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_5fda994e2ce23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491153/normal_600694d7ed76f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ffcbb798a0d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_6000c9321813a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_5fd2de838f3dc.pdfIn PDF document text
    • https://cdn.sqhk.co/junukexad/hhehebu/imdb_the_kissing_booth_parents_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404520/normal_5fff3673abf11.pdfIn PDF document text
    • https://cdn.sqhk.co/danajuva/hhgeidi/27252112383.pdfIn PDF document text
    • https://cdn.sqhk.co/vedoreket/jfuLhgO/anup_jalota_bhajan_sandhya_free_mp4.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/23421538949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_2986d537705643e6aaf420e8cd38c43d.pdf?index=trueIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_23184458706d46a0a1866f84bd34b3f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/code_blocks_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/bilaspur_university_online_registration_form_2018.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5308 bytes
SHA-256: a68f5ba07eda268f01cfff0594f773e29e53ed80866caa88777d3a9738af1330
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 11260 bytes
SHA-256: e2bfd2110bf21a8b9eb5114e0e782987b2513fff5cfbe6092dc31d9f5ff707a1

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