Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8fb5873a57b561…

MALICIOUS

PDF

78.6 KB Created: 2021-04-13 17:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c781a03d4ba5306e074ad07754c24a1f SHA-1: 794b6334bf0a34fb1138052212c20ce17cd0b59a SHA-256: dd8fb5873a57b5615a9473e50939906cc857fa8b207de298e575cb0f5d28b4a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://xezojetit.ru/strik?utm_term=how+many+community+action+agencies+are+there', are key indicators of this phishing or scam attempt.

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://xezojetit.ru/strik?utm_term=how+many+community+action+agencies+are+there
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/lifagifode.pdf
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5fc6e08f498b6.pdf
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/9086df38ff3e6.pdf
    • https://bovaxomasomi.weebly.com/uploads/1/3/1/4/131437143/wupojoxubobo.pdf
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5ff7d558ca86f.pdf
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fe06c0c5af75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed9fb24a-ad4b-4e1c-b6a5-2b6676a1cc2e/how_to_calculate_maximum_normal_stress.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/alien_shooter_2_game_for_mobile.pdf
    • https://s3.amazonaws.com/jesidofefe/befojufemakitifolaj.pdf
    • https://s3.amazonaws.com/tinivukedeta/arcswat_user_manual_2012.pdf
    • https://uploads.strikinglycdn.com/files/531cf279-b177-4212-b332-65c4bf7104c6/xuvesidebafogekotuni.pdf
    • https://s3.amazonaws.com/fefurorobumi/mulerukanirev.pdf
    • https://uploads.strikinglycdn.com/files/27e33de0-03e8-48c2-8478-165b59c3a065/samsung_refrigerator_model_rf26hfendsr_ice_maker.pdf
    • https://s3.amazonaws.com/jozetej/jewerorix.pdf
    • https://uploads.strikinglycdn.com/files/de363bbd-a7b8-4007-b706-8921c9c06e26/49925788317.pdf
    • https://uploads.strikinglycdn.com/files/4018e063-91dd-4639-906e-7c427615a765/yongnuo_yn-560_iii_vs_iv.pdf
    • https://uploads.strikinglycdn.com/files/a2a0501a-f67a-44c4-b22d-ba4d864504af/fadiboxajivujusotu.pdf
    • https://uploads.strikinglycdn.com/files/9ba48c0c-e5b2-49f0-8310-0e00057130fa/weber_grill_restaurant_schaumburg.pdf
    • https://uploads.strikinglycdn.com/files/98846c85-bcf1-4fe0-8b0a-4daadac5267b/vaboniral.pdf
    • https://s3.amazonaws.com/lulelepese/77506942953.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_off0000f28e.bin
d3735176b0a6c8578dc9541ecfd47f355656f0ed581d486d146ea26b52bf8efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5336 bytes
font_01_sfnt_off000104a0.bin
3ea859f03082d40d413c4abe949168b2ee83071998b044e3a9de490e242ccdd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 11284 bytes

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