Malicious PDF — malware analysis report

Static analysis result for SHA-256 604ecf49c4d65f74…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 11:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99b80d262f0f46e45497562d49672eb4 SHA-1: 90ded97e07e5eedb341e4f4ce172670fdf8f4b71 SHA-256: 604ecf49c4d65f746b6c8ca8b7d617c2139039332a56326a2c270c1d34652beb
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 0.9998

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://zajinet.ru/strik?utm_term=esl+reading+comprehension+worksheets+for+adults+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386337/normal_601794b5e29c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_6021a0336a207.pdfIn PDF document text
    • http://7gusevshop.website/5968718005939qvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fe85047894f5.pdfIn PDF document text
    • http://bogplaktnc.fun/1550752812152cns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388271/normal_5fcba74b51be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_6015ff3b77a30.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/4e64a47eb6e24.pdfIn PDF document text
    • http://ctyr.ru/sony_sa-ct260h_remote_app93x4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_6023d62bc2e44.pdfIn PDF document text
    • http://tehnopolis.org/samsung_galaxy_tab_p3113pixl3.pdfIn PDF document text
    • https://cdn.sqhk.co/mimizajig/xZgcvja/91276736005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_602a8ffb3c2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5fea18a61a445.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/6165330.pdfIn PDF document text
    • http://mklhhhh.space/happy_birthday_songs_funny922es.pdfIn PDF document text
    • http://blue-tick-central.com/nesibavepit6ckok.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/6085252.pdfIn PDF document text
    • http://nout-prokat.website/api_level_19_android_versionkheif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 5824 bytes
SHA-256: 6a543ebd262e1ad695375476170bc00573b578fc2ed162f7cb101a1dd869713d
font_01_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 11424 bytes
SHA-256: 4baa4a6e33df4c67c6826d3f8327bcfa0711570fa43833020fe178d92787166d

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