Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a53a85383ac6aad…

MALICIOUS

PDF

76.8 KB Created: 2021-02-24 23:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 31c0229b0b612e0e4bd0f6c096567f5b SHA-1: d7184f65c69a4db9c9a5daecce7188b3a423daf4 SHA-256: 1a53a85383ac6aadd682e059e34beac748ac02d55e02cd4e124a8f003f510386
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to Weebly and other domains, suggesting a link farm or SEO spam operation. One of the embedded URIs, 'https://bologen.ru/wix?keyword=nfl+team+financial+statements', indicates a lure related to financial statements. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious or spam content, aligning with phishing or SEO spam attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/wix?keyword=nfl+team+financial+statements PDF link annotation
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/nuzona.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/network_support_interview_questions_and_answers_for_l1_level.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/vans_old_skool_platform_white_australia.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/felofapopesipowilub.pdfIn PDF document text
    • http://drnextact.xyz/car_parking_game_3d_for_pck0f5w.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/2539109.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/spanish_dictionary_book_online.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/2825904.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/how_to_replace_igniter_on_englander_pellet_stove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jukezeluf/sipiwojobora.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/messenger_for_iphone_7.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/vuvuxowoto.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/97554947968.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/angular_5_e-_commerce_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 4576 bytes
SHA-256: eb7ac820655e8e9053a78cf0a06030f83981bb8715abe06e15aafb8044b9c8c9
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10888 bytes
SHA-256: a1225fab29b659d4843c177a3199c56fcc9ef5578a59a3ab265decaaa099185d
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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