Malicious PDF — malware analysis report

Static analysis result for SHA-256 38edff8429515daf…

MALICIOUS

PDF

79.7 KB Created: 2021-05-31 15:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dc53af43b8ad6a096ea47373a4dad881 SHA-1: 53397ffc52585cc270679b2a31cd72aea45ab1d4 SHA-256: 38edff8429515daf29ccbb9da63da744e3fd8c44f61e09ce0f4ce5c119c0906b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/123?utm_term=free+letterhead+stationery+templates PDF link annotation
    • https://nuzidobekoxap.weebly.com/uploads/1/3/4/7/134750252/numevifelu-naxara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5ff78761a2d9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409997/normal_60000582042fa.pdfIn PDF document text
    • https://pavexoseg.weebly.com/uploads/1/3/5/3/135315086/3955664.pdfIn PDF document text
    • https://romitigab.weebly.com/uploads/1/3/4/8/134864794/1730809.pdfIn PDF document text
    • https://rixolojujosu.weebly.com/uploads/1/3/4/6/134622111/lugojajeloriz-silajuf-kagerixe-runimakitunir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_606089ce939dd.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/dumebitekaziso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_6022245f1b9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_605ccb12b06f0.pdfIn PDF document text
    • https://sopudediliwaweg.weebly.com/uploads/1/3/4/5/134587721/pimiwuwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5ff4050bcd5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_603197895458a.pdfIn PDF document text
    • https://kagixopobexumel.weebly.com/uploads/1/3/4/6/134648921/929188ae.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/55888971-c15f-4913-863b-4178fa11b40f/the_crown_season_4_episode_9_historical_accuracy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d197e6-c0d6-4798-8b72-978e0525a68d/96332685664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7941d5-e9df-4490-9059-f7664ffd4cd1/filosofia_del_derecho_federico_hegel_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784d8bf1-5db3-439e-85f2-6030bce44cbe/vedufuzegulidusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da66767-9d99-4ae2-94d8-73cdad4b6c2c/garutotivijidiwaviwibato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7aa49e-03da-45e2-ba5d-818efee8ace4/what_are_the_four_gospels_in_chronological_order.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_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 5256 bytes
SHA-256: 25b76f3f0d5d1655a79b1d6a413bbeb83d7f20b8c35d3fce0cf5a246059508c1
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 10712 bytes
SHA-256: 53fb8d16a0035916e714e00955de46be8b539f1b6205777e3b5d83814af24ff8

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