Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dd49c8ab4b3e01…

MALICIOUS

PDF

78.5 KB Created: 2021-05-19 22:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8730088c4b9e92905a2b544ec2a39192 SHA-1: 9b7408f99d644cd2d74b0c1a0f2beca4dff9bcbe SHA-256: 74dd49c8ab4b3e01897b38ac87c98d5d4b44b33a6e94bb293c2cdc2f7f691a97
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The primary malicious URL, https://mezovuduw.ru/strik, is embedded within the document, suggesting a phishing or scam attempt to redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=apprendre+%25C3%25A0+dessiner+gray+pdf
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60353a8bb7c95.pdf
    • https://cdn-cms.f-static.net/uploads/4418791/normal_603be1fb28f95.pdf
    • https://cdn-cms.f-static.net/uploads/4381534/normal_6042187d4e798.pdf
    • https://cdn-cms.f-static.net/uploads/4379487/normal_6033beebc38e2.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60564baf09cc1.pdf
    • https://pusiravuzefabi.weebly.com/uploads/1/3/4/4/134483733/a7479144.pdf
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/fizazob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c174cd0a-78e1-4766-9bf3-6c4c9fb12ebe/foxiwakipuwum.pdf
    • https://uploads.strikinglycdn.com/files/fe2de795-b5a5-454d-bcfe-9d0373b0f70f/how_to_prepare_for_sat_vocabulary.pdf
    • https://uploads.strikinglycdn.com/files/7c20e4f9-9236-47d2-8b23-9500aa52c848/vopanetamipepif.pdf
    • https://uploads.strikinglycdn.com/files/0e016985-c711-4a6d-865e-5b3be01dbfc3/zejisapapaxesasasopo.pdf
    • https://uploads.strikinglycdn.com/files/43564881-35a9-4e01-9ca9-4079882f00a1/67612983880.pdf
    • https://uploads.strikinglycdn.com/files/cb6341e4-2edf-4ffd-866e-18a6479d15c0/tobamuzodaju.pdf
    • https://uploads.strikinglycdn.com/files/963979a6-0fd9-4d48-a590-e727e57b09f5/gimejukuk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd29.bin
ad0cec6c03e5712406d65897afca9f366224fbfe39aa3f28b97892cd5f5a710d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 5100 bytes
font_01_sfnt_off0000ddf4.bin
a67dc20ec814bf0ac7f1a3bbf55d7e3b517103da510ed3b42d9baee0fab229ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 13080 bytes
font_02_sfnt_off0001071d.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 16204 bytes
font_03_sfnt_off00011c4b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 4324 bytes

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