Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0964c6d3867d20…

MALICIOUS

PDF

83.2 KB Created: 2021-05-29 12:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0123d13ffc1c8c87699d4b2005a4e752 SHA-1: d1e2a2e85dddc6e78f6ceec9f5f704b48fccc809 SHA-256: da0964c6d3867d2000b785598dcbf1ff02e99a446d6313d7d8a606767d843e28
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. This suggests the document's primary purpose is to direct users to a network of websites, potentially for phishing or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a malicious intent to redirect users, aligning with common phishing and SEO spam tactics.

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://lozipotod.ru/123?utm_term=arya+2+songs++now
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fdce8ac1c3cf.pdf
    • https://static.s123-cdn-static-d.com/uploads/4384463/normal_60b00067d0be0.pdf
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/6099017.pdf
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5fda8abd74a8d.pdf
    • https://cdn-cms.f-static.net/uploads/4490365/normal_606cf84b59488.pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_603eb334bd57b.pdf
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/4616d2275.pdf
    • https://mivujekosos.weebly.com/uploads/1/3/1/6/131637271/xagebi.pdf
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fef377fbbd35.pdf
    • https://cdn-cms.f-static.net/uploads/4369160/normal_605fbffad260e.pdf
    • https://cdn-cms.f-static.net/uploads/4392195/normal_605caec52334b.pdf
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/aa674d.pdf
    • https://cdn-cms.f-static.net/uploads/4485440/normal_6034c2cf10a4a.pdf
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/ladewokozuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/99c7c272-41fc-4e2d-b4d9-f7f17900b95a/xamaxoro.pdf
    • https://uploads.strikinglycdn.com/files/d998528c-2274-4d9b-bacc-03565823ef4b/vupipuwuzidobiribitijupe.pdf
    • https://uploads.strikinglycdn.com/files/1d11c81f-c2d0-44c6-8944-3bd228923f68/reinforcement_concrete_slab_design_examples.pdf
    • https://uploads.strikinglycdn.com/files/5ff49e96-b4aa-4fb8-b352-93d36f5591ef/boveromepojogijivokane.pdf
    • https://uploads.strikinglycdn.com/files/a98e0628-672f-4bfe-8e92-4d95c816f7c3/26801063802.pdf
    • https://uploads.strikinglycdn.com/files/9fbc806c-70e2-4a26-9890-75b2191725e6/mesaximefoxowagumilagetor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd62.bin
971c9c21021fec95ea3d7643afa45b00b979837fc15e0e68aaa774d8662d3a89
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 4680 bytes
font_01_sfnt_off00010d4b.bin
25dab52f52a5553b579c10d9c4ea762729411e6612d023bdab55518f5e5b42e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10816 bytes
font_02_sfnt_off00013191.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 4324 bytes