Malicious PDF — malware analysis report

Static analysis result for SHA-256 7660cf7df89e17e1…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 19:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e427be23ef58e87f8fb9141f1d0bfb SHA-1: 763c9e79c92689a8f6d990d37925bdcf99147c6b SHA-256: 7660cf7df89e17e1b9451c363d6710de1c711de11ef3afc75f2c3f0f9f66c24c
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 to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript to facilitate redirection.

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://zajinet.ru/strik?utm_term=weber+smokey+mountain+18+parts+list
    • http://xxlmature.site/pagabasipuferunokuh97f.pdf
    • https://cdn.sqhk.co/xekawiba/hdV0Sli/photo_editor_app_with_sparkle_effect.pdf
    • https://cdn.sqhk.co/dujagazatad/NghFidX/17588974507.pdf
    • https://cdn.sqhk.co/nedupugifuka/ginhcia/pirates_pearls_match_build_design.pdf
    • http://ita-fitness.fun/the_uses_of_enchantment_summaryyjh2b.pdf
    • http://tradebot.space/forgotten_realms_collectionye015.pdf
    • https://cdn.sqhk.co/zibomevuguli/fbciim0/duvodakotowaja.pdf
    • http://fbdirect.site/a_critical_survey_of_indian_philosophy_free_downloadrc8kt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisapovepizaj/faxin.pdf
    • https://uploads.strikinglycdn.com/files/f3b16c32-2e8d-4a80-b0e2-be97930664d8/3202620399.pdf
    • https://uploads.strikinglycdn.com/files/823c2a46-d78c-49ba-a446-fcb38b2a03d1/nordyne_furnace_error_codes.pdf
    • https://s3.amazonaws.com/fedure/68748819284.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_f8249cb2f27341e1b3f285b94db938c6.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_0d7113bec957495282d3a0ccdad8ed08.pdf?index=true
    • https://s3.amazonaws.com/fuwenoxuzasila/letter_format_in_english_for_school_principal.pdf
    • https://uploads.strikinglycdn.com/files/92ffeab5-6626-41cb-a97e-de012670a1dc/actiontec_wcb3000n_setup.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_off0000f401.bin
926a0bf204cc87889cde9c4c473742f633cf048650e6f3f582ab25a8b81695ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5528 bytes
font_01_sfnt_off000106c5.bin
80a4cfd859b9bb1e8faa36d0b2de836cd4647eeb869bd113d8e2047271df502c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 1912 bytes
font_02_sfnt_off00010ff4.bin
9af532767682c65e3455547dbcd640f8df2d189cef7314147ae4eab989bfd911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 11092 bytes

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