Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d98e82fef00442f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-29 23:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0aef723414dddc2da582d53b0f6ef533 SHA-1: c1610a15bd0a0c64d1089f12c3adb83bbeab969c SHA-256: 3d98e82fef00442feb355a0fe3c5cde9fb5fdf55611b6aaad4b87646a96d72df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/wix?keyword=patch+adams+movie+worksheet+answers PDF link annotation
    • http://ifeelgood.club/61053081248e16ck.pdfIn PDF document text
    • http://kunutudusoxa.mywebcommunity.org/89313136777.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/xovavoderizan75zl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_603277a722de9.pdfIn PDF document text
    • http://reduslimitalia.site/3870898240577jhj.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/81874063043.pdfIn PDF document text
    • http://thedopemarketing.com/zudazegodefositi54gao.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388038/normal_5fdffef977f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_5fd2dbfbf260a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_d8b23767eecf4b9c806940effd680262.pdf?index=trueIn PDF document text
    • http://limufewugewo.rf.gd/audio_video_er_app_for_pc.pdfIn PDF document text
    • http://sikamavidasatam.epizy.com/sepowudufaduribenasexade.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/69912203024.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_234c660eed0244378f76f3e89ad80495.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/21745486575.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_b0bf11087c73413dafc57c9fb2a2d8e9.pdf?index=trueIn PDF document text
    • http://goviragukipi.epizy.com/caravelle_interceptor_212_swim_platform.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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5364 bytes
SHA-256: 0e7ebf841b526a882db0fc41de618021fe40cebf8c86342ff920a5e2783c9532
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10928 bytes
SHA-256: 8b998f1d1382f51c4a412def55331cb6792d27611ac1f2c3f0c4525dc037edde

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