Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea187e3c8f7429b3…

MALICIOUS

PDF

72.5 KB Created: 2021-04-04 18:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253818fc48fd65363c1979740d856a58 SHA-1: 969ab6fe738e84c4e615f3233aab5e8623f53ce9 SHA-256: ea187e3c8f7429b30080a07c6ab100d4a72b5b8df9e1cda85b29d58334cbc165
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "PDF link farm" designed for SEO manipulation. The document body, though heavily obfuscated, suggests a lure related to "prior authorization forms". The presence of multiple unknown URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://dafemum.ru/123?utm_term=bcbsil+prime+therapeutics+prior+authorization+form
    • https://cdn.sqhk.co/modajili/K0Hgd5z/penunolapabafewe.pdf
    • https://cdn-cms.f-static.net/uploads/4381547/normal_603e949c3603a.pdf
    • https://cdn.sqhk.co/tudobele/heieUdz/59156972822.pdf
    • https://cdn.sqhk.co/kuzefoke/jWvrrjd/money_lobby_gta_5_xbox_one.pdf
    • https://cdn-cms.f-static.net/uploads/4502500/normal_60505f87066e8.pdf
    • https://cdn.sqhk.co/fudamozomeb/gi4iinK/windows_10_home_64_bit_price.pdf
    • https://cdn.sqhk.co/safovokon/fjb4ge0/78555188870.pdf
    • https://cdn.sqhk.co/feripamapuv/hetMiau/chess_openings_black.pdf
    • https://cdn.sqhk.co/fapolokid/heeajfI/lego_hidden_side_app_tablet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/magapeguwabe/best_sound_quality_android_mobile.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_f9f5ab686d244f97b30a623a1a0c7cf1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/772755e0-a90b-45b0-9fb6-de2f802507a6/96255958794.pdf
    • https://s3.amazonaws.com/loxopudizus/96171862339.pdf
    • https://uploads.strikinglycdn.com/files/b812fdbf-b783-47e7-963f-e7b327eb6daf/alphatrak_2_test_strips_where_to_buy.pdf
    • https://s3.amazonaws.com/jadudusujuje/how_to_type_p_copyright_symbol_on_mac.pdf
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_0ca08e9e220349c68c0e03d9d9135128.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a95444ad-ed8c-49cf-bcfd-5971164c8748/angela_carter_bloody_chamber_amazon.pdf
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_4b82a05d1d91462cbbc594aa60201741.pdf?index=true
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_ab79edc2103c4d45b31893fa112b5019.pdf?index=true
    • 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_off0000dc89.bin
fe8a4c8aeb0add4e5160aab97362ea3d1a6d3187b9a87124c6280ab792490599		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 5492 bytes
font_01_sfnt_off0000ef15.bin
5b8e9bf2ffb55a1389c985a5b8df4f3cc16693b9954cceaf44c2df7143c9d04d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10492 bytes

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