Malicious PDF — malware analysis report

Static analysis result for SHA-256 da521493b136d383…

MALICIOUS

PDF

81.9 KB Created: 2020-12-05 10:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a18c2bf715120a8ffe22c4127829f41e SHA-1: 1eefd5d6a2c6e17517cd90d0b5ae1b8ad77d30bc SHA-256: da521493b136d383662c08ebe7091fbb1c26348506e1d67240ce712339cceda9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://traffine.ru/aws?utm_term=meaning+of+cost+sheet+wikipedia PDF link annotation
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/wabumukubon.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/tedosepufomojef.pdfIn PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/7820598.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/6618594.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/bakedilajibejo-lapulo-dodovopizo.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/zatij-zuram-xukimodesixana-sesukuwaz.pdfIn PDF document text
    • https://kemusawef.weebly.com/uploads/1/3/4/7/134770671/wizokejefo_kixugij_fukurej.pdfIn PDF document text
    • https://zefutijokizire.weebly.com/uploads/1/3/4/8/134868110/7966755.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://static1.squarespace.com/static/5fc56d376b97992eb57a16b7/t/5fca9db6dd8a8730b06e79c3/1607114167119/jb_home_furniture_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/the_broker_john_grisham_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/alejandro_chaban_diet_plan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2acc97d0c8f249d4c3d78/t/5fc544a73c02f22b9db950de/1606763687652/45281815232.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/rbi_grade_b_2019_notification.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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 5240 bytes
SHA-256: 50f19f7a397858adf86fca68f5490257f6df7c498c3e7c70bfa71fd52d01791d
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 11464 bytes
SHA-256: 7ff7664bd56a3b3622eaca1cffef989cd518a47864134a868425c50575ac42e8
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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