Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22ca7e1d43416ac…

MALICIOUS

PDF

70.7 KB Created: 2021-06-04 23:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 339c9f75880e70e33970baa44d24264f SHA-1: 27e0ebcccbd8596645c046611083a306d0eceb7a SHA-256: b22ca7e1d43416ac13dc85f627de04e2113c90dfaebd499b81549b05d4fddcfc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism for phishing or malware distribution. The document body, though truncated and containing non-readable characters, includes a title related to speech conversion, likely a lure to disguise the malicious intent.

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://laborke.ru/pbw?utm_term=how+to+convert+direct+speech+into+indirect PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4485818/normal_60b6c6fc017f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_602a84372c8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_60406b0f7416e.pdfIn PDF document text
    • https://dizokilupufenof.weebly.com/uploads/1/3/4/7/134767898/wazefegopi.pdfIn PDF document text
    • https://vewifofuk.weebly.com/uploads/1/3/5/3/135394013/zokakuduvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_606298f77701c.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/0951f.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/binix.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/5624274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_60038e1d8ec72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d78259-5311-407d-9ba3-1e0762f06808/megusavoxodabira.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/f/creo_parametric_5.0_tutorial.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/conjunctions_and_compound_sentences_worksheets.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/lumunumevabali.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144572517/gowafurolabozajalixodamuv.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/f/fabaresakanegujaremu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c49032-aa20-496c-8282-ec29683d1a1f/8720030564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443c0344-7b97-4f3d-8f1a-7789554a89e8/19032063513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2000f2fc-d414-416e-83de-c348bd5ffc8a/did_damon_die_season_8.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144517725/panirugenamavaran.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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 5032 bytes
SHA-256: 0e2c4bc9dbd31add44d228a01dc37187e1971041a554565875ab33eae9e19ea8
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10216 bytes
SHA-256: d3af214d6d953c20688e5f5d882495eab7f6d1aff1090598d6cf29c1b9b8a69b

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