Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c5000742f135f1…

MALICIOUS

PDF

75.5 KB Created: 2021-02-20 12:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 798fe168b6c4e47d2e9faab8d881fc87 SHA-1: 29bd934283747e39658af781ac7cda9dba35b38f SHA-256: c6c5000742f135f18fa1e38d27fdeebf55fc5eaec07918d287d641001bb8fa7b
186 Risk Score

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://jottigo.ru/123?utm_term=coast+guard+body+weight+standards PDF link annotation
    • https://ludopugadataz.weebly.com/uploads/1/3/4/7/134709803/gujaj.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/diajjid/97532282023.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/heKc3pl/38990324525.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/ribolanakipugisow.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/5jdYqZy/34730634490.pdfIn PDF document text
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/6857297.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/polezenofiwupal.pdfIn PDF document text
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/bec8810f0c3c1b.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/8gcNaei/h_and_m_baby_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ippjdBs/82984486595.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/soheBgj/63661966196.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/bPic2Um/tofonubilirinud.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/mih7sig/88599711491.pdfIn PDF document text
    • https://koloxajemixe.weebly.com/uploads/1/3/1/4/131482821/7247673.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hdWgcCL/cannot_top_up_my_ee_phone.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/e2b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/cPjazjd/fadugepalenobabaxob.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/1a190.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/bajapovogam/70945227288.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 5296 bytes
SHA-256: 531d6d7bafa5668816d23822b97480cb0cf0f93c751cf5d37c9a43d4ed73fdee
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10796 bytes
SHA-256: 623f0595a8e2e0825cfaae7f45c957ef6d13622d9faec1f5e85440eb9d6a123a

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