Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e29d47cfb1d73c7…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 00:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d347a674ec0bbe74d4d0277297ab9ad SHA-1: 4699fe2f54cbfd36f0df61727755da7a3a670947 SHA-256: 3e29d47cfb1d73c7c82bd21293189feda25138dc154fd46cd1cf464144bc2490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/123?utm_term=chyawanprash+1080p+video+song
    • http://bachanalytics.com/how_much_does_graphic_designer_make_per_hourupctr.pdf
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ff29c2947561.pdf
    • https://cdn-cms.f-static.net/uploads/4500878/normal_60447605c5bbd.pdf
    • http://wewonuzux.22web.org/envision_math_grade_5_teacher_edition.pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6872699d.pdf
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/bukuxutipej.pdf
    • http://blue-tick-central.com/41529353318kh11f.pdf
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/puragifixawas_tadelo.pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_600ee71fecafa.pdf
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/1434234.pdf
    • https://wesamirovajep.weebly.com/uploads/1/3/5/3/135383051/4844469.pdf
    • https://static.s123-cdn-static.com/uploads/4420224/normal_60012bfbc8366.pdf
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/6565a691.pdf
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/wavoduzapuvora-zukonorupinije.pdf
    • https://cdn-cms.f-static.net/uploads/4427284/normal_6013e9466a2d9.pdf
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5fddb0231fb1d.pdf
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/22730a6c8561a0.pdf
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fdae8685de20.pdf
    • http://rentline.pro/do_you_need_math_in_businessck8ex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molulig.epizy.com/types_of_musical_instruments_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f675.bin
79d267a1c19eccbcd7d2de94a779d40ac57246295181c84c8fe7903eea235c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 5736 bytes
font_01_sfnt_off00010a15.bin
0643953385c51d33e716b37a8a73a704f1ca5b2e7793a7cee939d4dca30b2a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 11716 bytes

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