Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d7d20ace35afe0…

MALICIOUS

PDF

98.8 KB Created: 2021-05-30 05:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151ccec8d38e8dfc97515cbf701ba604 SHA-1: 6fefd345ae48c54ab1ebad249ebb8380db12b058 SHA-256: 41d7d20ace35afe0f5ebf2e763b08000af7d1da6f7f74c1a1a3fdf0c5565264c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding malicious links.

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-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://seumenha.ru/strik?utm_term=the+red+queen+matt+ridley+pdf+free
    • https://cdn-cms.f-static.net/uploads/4467560/normal_600a75ca23583.pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_604645cf9ea3a.pdf
    • https://jugusunoju.weebly.com/uploads/1/3/4/6/134625161/9329484.pdf
    • https://static.s123-cdn-static-d.com/uploads/4480880/normal_60b2734a0aa27.pdf
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5fec35535fee8.pdf
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5fc95bd71bc60.pdf
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/kijenezupirafer-gudezani.pdf
    • https://cdn-cms.f-static.net/uploads/4455399/normal_60292347e2c24.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_601f549b7a4f7.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_60519a2da56c2.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6022dfd0e81a7.pdf
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5feffc4008e2a.pdf
    • https://cdn-cms.f-static.net/uploads/4421336/normal_6044781ade582.pdf
    • https://cdn-cms.f-static.net/uploads/4424025/normal_604da4c5265ff.pdf
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6013c16c34cbd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1fb2402-7310-4499-b5e4-7057c050ade6/sennheiser_xsw-d_lavalier_set_digital_wireless_omnidirectional_lavalier_system.pdf
    • https://uploads.strikinglycdn.com/files/c07d22c8-4a42-4364-bd2e-1686eefda473/netgear_fast_ethernet_switch_fs108_manual.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_off00014348.bin
0279fc2726ef99412856eb54b52762a5e63ee3c532a13513d1b6c64d39f2cd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 5280 bytes
font_01_sfnt_off00015514.bin
b5a1fae6dc6fa3c5ecf7dfb73f724ba301591646982588b876b7172cebd0b1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15514 11640 bytes

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