Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9d8c95313e223a…

MALICIOUS

PDF

81.3 KB Created: 2021-06-09 00:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 29ba8e9c8cdbc6d709fcafa4f48507ea SHA-1: de000eea3dfc87d321921f6346c8ec7443cf776c SHA-256: fa9d8c95313e223a01f940d96f6919f814351e292c131240d709db8a36c8dd62
234 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. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=nck+dongle+crack+2018 PDF link annotation
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/majijidafu.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/516983.pdfIn PDF document text
    • https://zuxolawez.weebly.com/uploads/1/3/4/1/134109286/garurunegisijiw-jajekobimu-pujavojozutipag-kiwenarip.pdfIn PDF document text
    • https://juludexawov.weebly.com/uploads/1/3/4/6/134632047/512d8090e7e50.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/lofajipevipo.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/3d4ec2da9f9631.pdfIn PDF document text
    • https://xepozusaba.weebly.com/uploads/1/3/4/6/134613274/birulo.pdfIn PDF document text
    • https://kibixaxetoro.weebly.com/uploads/1/3/4/8/134861284/sodupuxabetex.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/berisasajewafoz.pdfIn PDF document text
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/maweletaji_fedasakubokiku_zuzarojo_nozebozeze.pdfIn PDF document text
    • https://gususofutuzur.weebly.com/uploads/1/3/4/9/134901105/jorozobemepunar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_6028ae4ed59d2.pdfIn PDF document text
    • https://waronovubuwige.weebly.com/uploads/1/3/4/6/134631102/julegidinuwediderok.pdfIn PDF document text
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/4568212.pdfIn PDF document text
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/migevatop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_604260327abfd.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/4c3b75dbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sorawako.pbworks.com/f/mivozedugolol.pdfIn PDF document text
    • http://zudilazo.pbworks.com/f/free_printable_flat_stanley_template.pdfIn PDF document text
    • http://kesowununak.pbworks.com/f/beamng_mobile_apk.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/82092351137.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/mawirujosiworoki.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 2900 bytes
SHA-256: 513d5a9118174e9c4330ae7c5fd9607b6f870a3bfb1ce94b5ba7e75dd22ffc14
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 5480 bytes
SHA-256: 47360f53bf2354da4986cf2973d8caa58c13d2871d3e431e85ce306232431b4d
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 11236 bytes
SHA-256: 0bdb9f812f4af32c1f15473c10e6f4529513911bc747b3cb0ebf5b13e855f257
font_03_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16160 bytes
SHA-256: 5446d8693f472ebe56539db1294e6b993809411a69d567c9d8907fa578c39aa0