Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dab1ad5a0e3bce9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 12:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a40020649a4d01f1f1f7d45d7ba629 SHA-1: 270db81fd97c7ba026428dcfce8fbedb997ab322 SHA-256: 5dab1ad5a0e3bce9d4d58494ce935e3ea1166880b690f07610f89051d526748d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one suspicious URL pointing to dafemum.ru, suggesting a link farm or phishing operation. The document's content, though heavily obfuscated, appears to be a lure for video content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://dafemum.ru/123?utm_term=lamborghini+hd+video+song
    • https://static.s123-cdn-static.com/uploads/4383689/normal_60089ccc309df.pdf
    • https://cdn-cms.f-static.net/uploads/4475588/normal_601a44f423c34.pdf
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fda7a0ab855d.pdf
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6055f990d066f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_a34ac1bb3df24d0e917d08e97b43b530.pdf?index=true
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_8f39c071c5904ca6885c83c3503e0945.pdf?index=true
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_301aa4d2811c41ac88d4595e3b73026a.pdf?index=true
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_d8d6692d386e4097833c8b95ac2052a9.pdf?index=true
    • http://rogidisili.rf.gd/metric_conversions_worksheet_answer_key.pdf
    • http://sadamenukovizep.epizy.com/functional_programming_in_c_enrico_buonanno_download.pdf
    • http://sonapap.rf.gd/sedorivukaxabenosijez.pdf
    • https://uploads.strikinglycdn.com/files/02994b8c-062e-4287-bc58-3d054276b15a/jesogikuwuxugin.pdf
    • https://uploads.strikinglycdn.com/files/33e434b8-6de0-4026-87e3-77aab2b15074/malibalipawu.pdf
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_99d32d347c6c4a728e1d45c6b9c7b3be.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_0aaf3811caf84658a91c4fa53ecc99a8.pdf?index=true
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_a3b08cb955814b819846a6e0d982d801.pdf?index=true
    • 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_off0000f1b1.bin
bd7024a2457079582a287f32979c1b7d0697237e3477b75b446bacb1512afd7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5348 bytes
font_01_sfnt_off000103b3.bin
902ee75fb898e5a04ea5729d4ed508a6897178c9775ef0fc99c80c2e2061ebfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10744 bytes

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