Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cb72289dc4b824…

MALICIOUS

PDF

77.0 KB Created: 2021-05-15 15:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 384afed14c01d132a39e43d2cbd7c2db SHA-1: 95e2e49c2c3771174b19958bab99926b226515b9 SHA-256: e1cb72289dc4b8248ba10fd14411cfb5fdc72fbf886070f6d94e421c4da4efc4
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://xajibur.ru/strik?utm_term=graco+my+ride+65+car+seat+installation PDF link annotation
    • https://sumesomorap.weebly.com/uploads/1/3/0/7/130738681/9657320.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/nobijibezesumumalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451549/normal_5ffb06a8ece37.pdfIn PDF document text
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/tifuketaz_dalusuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5fd384cbba8be.pdfIn PDF document text
    • https://pojasulexubu.weebly.com/uploads/1/3/5/9/135993084/rikiduvoxajox_bexinazik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_5ffd4cac02630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_603bc98195872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_60156bb92f7aa.pdfIn PDF document text
    • https://donasidavojixa.weebly.com/uploads/1/3/4/4/134494786/6cff53b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_600d42b78ce47.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/wexapuniv-fuligana.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/fasubipi.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/ffa0b787531888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5ff6690d4cc25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/which_friends_episode_is_the_story_of_your_life.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_6e78e1e695354aba8bdf6af3637b60e5.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_c99bc713b6a2470786188f273c43a869.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_7f847ded16be49e293fa66a879da78aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/76880487412.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_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 5496 bytes
SHA-256: b9e4e00d36bc38175b7c6223413d6fad73e3ba1c411430c67c90a277ffdd6a86
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 10292 bytes
SHA-256: 5ad49c1860f073b16f8d7006a367f9ad6c2ebb45b3bb21335d4ef30d2b7ee428

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