Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b9491b903fe05c…

MALICIOUS

PDF

150.7 KB Created: 2021-02-16 05:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb070d855103d49071045d36feccf351 SHA-1: 5d3808ecc33cad75510f9b3a38ae49d7df60256a SHA-256: 38b9491b903fe05c076d91b8d5fc9da71d3c6d11c32d2bbce97320c55eb057d9
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://baarspo.ru/strik?utm_term=navy+officer+recruiting+station+columbia+sc PDF link annotation
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/tuzomajuxizo.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/miduset.pdfIn PDF document text
    • https://lugarulanug.weebly.com/uploads/1/3/5/3/135383187/fajoba-tagoronodenu-fijabige-xubimevazafor.pdfIn PDF document text
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/mukifoxilok.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/dofonulig.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/bfbf5f093.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/kizut_jifus_nutadu_satitojosiragov.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/roxavowazaz.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/a993ce1f5217aa.pdfIn PDF document text
    • https://fetozala.weebly.com/uploads/1/3/4/6/134678703/fe47c5c.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/9868775.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/gawuduvusedadovuti.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/3734072.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/garorowa/checkpoint_datasheet_5900.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/34793913547.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/ralipurafevakutageti.pdfIn PDF document text
    • http://bikumekomem.epizy.com/fopopexedomiroza.pdfIn PDF document text
    • http://bexumonege.rf.gd/dakufomaroxafa.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/fishing_report_chokoloskee_florida.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_off000211eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211EB 5472 bytes
SHA-256: 460377619108810a18087d38d2c7d7311279b9f141e8f2a2851b6e028188a2a2
font_01_sfnt_off0002248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2248F 11580 bytes
SHA-256: e26e436478345bba3a06d7f14594640088ecbc0154f13dc14e4fc170f4f354c3

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