Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f867b8a362753a…

MALICIOUS

PDF

73.2 KB Created: 2021-06-13 20:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d50db8f60c36ee1e2c93ec3a26877273 SHA-1: aaca334d3e45296cba6c4225255718158049515b SHA-256: 85f867b8a362753aefca9365118064a239c01cfbab36fa2cf4bf7901cf25f582
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to downloading music, aligning with a social engineering lure.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=how+to+download+music+straight+to+your+phone PDF link annotation
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/zazufunenutos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ff292e3bfb16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_60048fb84d7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_6061e9d4d5050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_6021e9087b940.pdfIn PDF document text
    • https://fafogefefotal.weebly.com/uploads/1/3/5/3/135314601/gobatit-nasefajudego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6a1b411d5.pdfIn PDF document text
    • https://davanowaxisipu.weebly.com/uploads/1/3/5/3/135318110/vilesawe-nikeberag-nagutejuwer.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/a6106a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fe4019a7aead.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikopatepo.pbworks.com/w/file/fetch/144988953/10545680056.pdfIn PDF document text
    • http://vesenimu.pbworks.com/f/66143142537.pdfIn PDF document text
    • http://vinivat.pbworks.com/w/file/fetch/144736392/standard_catalog_of_world_coins_free_download.pdfIn PDF document text
    • http://bidudilobofu.pbworks.com/f/xosaxozomamujimivaxis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/208414c6-218e-421d-933e-efbb171603cd/how_to_send_a_test_fax_brother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d772af5-15d4-460f-b5ab-9283e5e59a80/ensayo_argumentativo_definicion_y_ejemplo.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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 5644 bytes
SHA-256: f8205c06d3da41be75c14134fae3d1f0ff28e881bb994ccb160cd3e8bb8b56bb
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 12480 bytes
SHA-256: bc629c681fba7b0e468f28c4eb5727f85b6c7eb6d27aa63a54ba97ffd248faf4

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