Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca935cd96c44042a…

MALICIOUS

PDF

144.5 KB Created: 2021-02-25 01:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 60103d12ad4aad701c480eac73c075ce SHA-1: f6913f3249d593410fcaec1ceed7a464acd00442 SHA-256: ca935cd96c44042a16e8cfa5dd428c239a9ccb3b4aeb48c87584858021b5f6e6
242 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+lean+six+sigma+black+belt+training In PDF document text
    • https://cdn.sqhk.co/vekuperik/bXYiaxH/dragon_mounts_mod_1._7_10_minecraft_forums.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/hgLwuej/kalogux.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/nurenazikiz_xugew_lomugijukowisus.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/448148.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/jjygeha/transferwise_login_without_phone.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/rotilex_kewugak_bimesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fcc93bd3cead.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/6c2aedc.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/jidisibe.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/8a594bd1031.pdfIn PDF document text
    • https://bunoworerut.weebly.com/uploads/1/3/1/4/131438217/9313282.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/6726710.pdfIn PDF document text
    • https://kumuditev.weebly.com/uploads/1/3/2/7/132712302/9618528.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/awjdggl/burijuxidipa.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/bufipevuril/famowenoduzara.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/datasheet_catalog_lm317.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/sciatic_nerve_pain_treatment_guidelines.pdfIn 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_off00020739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20739 5496 bytes
SHA-256: 524e04000143ad31311d8d1953dc15e8aff36ed3f36e6e737784a8dae70d07f1
font_01_sfnt_off000219d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219D6 13820 bytes
SHA-256: 1242adfd86d4f33aa2aab9b7b1f7952b6678a83052a892be863891ebbab35ba8

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