Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c12785949b3e8c7…

MALICIOUS

PDF

83.8 KB Created: 2021-05-28 16:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32eb28e3b8db73f5e22dbd3d9652f845 SHA-1: 9e2a33c69d0e2b696f1990e90ec8e4a25213c4b4 SHA-256: 9c12785949b3e8c73ba987fbae4dd28cb394e632ba271e54037d3d06cb77755e
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=ejemplo+de+portafolio+profesional PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374545/normal_6057dd9ee9156.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/ropoxig_xanilo_kotur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5fe3386007828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_605cbdc3e97e0.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/32270.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/fujulider-zaduwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_6003c0278c685.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/pujimidebedijuf_sokepova.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/9ec6a60a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_602d047698eab.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/kilateweneso-xataramomu-dorifopap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fd863ef91f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_606394808f2a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5ff2068f2338e.pdfIn PDF document text
    • https://xazusajapefo.weebly.com/uploads/1/3/1/3/131383727/dimawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_60016b8985188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_602096ece00a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_60280359876ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_60323e3137f7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/add71ba5-6140-4849-9d62-250e8003fab5/66378691053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0215e67-06f1-4413-a39e-ded268e363ab/phonics_assessment_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ef15a6-8d33-45e2-aee8-9c0043d9b5d3/where_can_i_buy_daphnia_magna.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_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 5220 bytes
SHA-256: c49adf49d166d58eeadead329a54719a001f1f41dfc0de704b6d843072910009
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 11856 bytes
SHA-256: ccd6c26012632fe006d33f46e6fd01bee8173da55cc8bca50bd514c824c80923