Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcab7a7eaa31891c…

MALICIOUS

PDF

74.3 KB Created: 2021-01-13 17:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 253fa844bdf6a81d8e939f066a8b2ce0 SHA-1: 3ba67d705dd15740d25b215eb5deaf5c3aeae7c1 SHA-256: bcab7a7eaa31891c69db5c8814861bab95964bbf44294d5abd92eefe563e87ca
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The presence of a malicious redirector URL further supports the malicious intent. ClamAV and ML classifiers also flagged this file as malicious.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=html5+video+player+for+windows+7 In PDF document text
    • https://gusotefatimadi.weebly.com/uploads/1/3/1/6/131636747/7a6e3a8b.pdfIn PDF document text
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/5958019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5fcd31ff7191e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fa732026e0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5f9e0123cb5ad.pdfIn PDF document text
    • https://lusefova.weebly.com/uploads/1/3/4/5/134583673/xefitudakifiro-lodidixusexi-pisawixopam-wonipusazoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fe03cfec7ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5f973a8abf2a1.pdfIn PDF document text
    • https://parixaxagutu.weebly.com/uploads/1/3/4/4/134465429/nezixipokibewog-lasusazonedegof.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/mimebovozapenawejugu.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/ferulefigujebovepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fabc33154caf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vovopafubipu/hd_nature_background_for_editing.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/kshatriya_1993_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/62595614812.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 5392 bytes
SHA-256: 01bf1e7830c4cdb392fb6600f9df63b8f1235200aa65e20f75752a0287d56912
font_01_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 10616 bytes
SHA-256: 4dad09217c6064b60d0ffc2e4057cb4a3e87c173fdb4519d75438d6628d6098d
font_02_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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