Malicious PDF — malware analysis report

Static analysis result for SHA-256 9641aa088c820dbd…

MALICIOUS

PDF

58.4 KB Created: 2020-11-16 17:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 32672fd8c70348a744d606506faaaff4 SHA-1: db1f05bcd96661d1d6ee86627176caadca892413 SHA-256: 9641aa088c820dbd21138af456c23a3cf533c6924f0727334996343ef236e605
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 0.9996

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://trafffe.ru/123?utm_term=gorham+sterling+patterns+list PDF link annotation
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/1438862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f8870f5a7822.pdfIn PDF document text
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/mulotopavepiwag-gumogu-zafinotanowa-sarune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fad8197c20b1.pdfIn PDF document text
    • https://febawamowezifu.weebly.com/uploads/1/3/4/5/134594075/vekifanemewiges-tibovisemodad-xowodekumek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f94e754e4488.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/6592166.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/982c93e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fae57a2a63de.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/jexemox_wijezabufu_jopabaj_jesirerozilifon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5f9d7aaeabad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f8df74f361a5.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/d7d75cb7-c77d-46fd-9287-b27979930f4a/vegarinozan.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_off0000aa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA38 5264 bytes
SHA-256: 9e323a50d7166d2d990fa16cdc44e59ebf6e624271bfd8097546e68c49b5e87c
font_01_sfnt_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 9728 bytes
SHA-256: e62d1511d55afa404936ab9307284bd9a573012d0d5cd451aee2f2018a47ce86