Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc18186a0a5ade71…

MALICIOUS

PDF

66.0 KB Created: 2021-01-12 12:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b8345f1bd10d07f0fc590961210f3afa SHA-1: efe30a7a38dd8fe60f10432e6f7a789c3b2b44ea SHA-256: dc18186a0a5ade7102cf963df4b549365ab3857cd9e6204ecfe688543c61e2f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffi.ru/123?utm_term=linear+slot+diffuser+with+plenum+box PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381340/normal_5fef0a3b82ccb.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/jiaijUI/download_sound_effect_youtuber_free_fire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_5fd8eb852555c.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/igBsChc/68431982933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fdc37d24c3cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5ff6b965b1e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fdbb7b18dfe3.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/duromemup.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bhdZnb1/cut_up_lyrics_ned_s_atomic_dustbin.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ggXJghE/flipman_skip_tracing.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/tugumeb/45558541077.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/putilexusosovulupel.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/bidesives.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_off0000c4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EE 5524 bytes
SHA-256: 7cb7f9e317df233ae6bfc41cfdbe33e60b3470956a65c61b2a186f26a98e9f4f
font_01_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 10468 bytes
SHA-256: 0e50f51a30520e3fa55c1a118c58b0c0fee4d48ca44b8689dea97a05f76f1018

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