Malicious PDF — malware analysis report

Static analysis result for SHA-256 febbb622ec2da1be…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 23:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ca64ebf03f88da73d721d6b8d2e22e SHA-1: 78f783d36bbdf30c7eb2f6dfda3d77b4b05ef035 SHA-256: febbb622ec2da1befad7d61d67b7f81c81660e0f63cd3168f6302ddd9812f4ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a tactic to drive traffic to potentially malicious or SEO-manipulated sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+to+connect+cricut+crv001+to+computer
    • http://the-glow.ru/853593490485romr.pdf
    • https://cdn.sqhk.co/vekudaselux/SxfqL9J/loopy_case_iphone_xr_ebay.pdf
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/bositufe.pdf
    • http://freud.icu/pdf_to_word_conversion_online_without_email98uoq.pdf
    • https://cdn.sqhk.co/rikopekela/bcSZjiR/55077147717.pdf
    • http://trening-ekaterinodar.ru/interview_questions_for_potential_team_membersoy7ha.pdf
    • https://cdn.sqhk.co/letinumi/an3iqjb/73709343789.pdf
    • https://cdn.sqhk.co/kerodamajop/6KtEWji/batch_to_apk_file.pdf
    • https://cdn.sqhk.co/sanobude/fgfjdwp/rejozoxibu.pdf
    • https://cdn.sqhk.co/viwiratoposu/jVfidsB/stunt_truck_jumping_hack_apk_download.pdf
    • https://cdn.sqhk.co/kevovevude/depPBvp/stack_ball_3d_ios.pdf
    • https://cdn.sqhk.co/lunabati/ijMRjaE/eric_s_new_york_style_pizza_stockton_ca.pdf
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/nirefetusigon_bibaroduv.pdf
    • https://cdn.sqhk.co/lupokuna/hXXDgeO/gepiwodarojubivojinidivod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://soneloratugop.epizy.com/teaching_reading_approaches.pdf
    • http://kunibenurupamiv.rf.gd/67660939312.pdf
    • http://zoxokukazo.epizy.com/24094523743.pdf
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_1074e1353e314255a7529ca6a86c5835.pdf?index=true
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_981a213c8da2483a83e0e4e398deb17f.pdf?index=true
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_3ade9e55799149f7a701855d9bcba73d.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_off0000eaaf.bin
ab378588df390fb537b9f782e892a40abf78f2abd7deb3bcf5dd5ed6dec0844f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 4968 bytes
font_01_sfnt_off0000fb9e.bin
4249b82d2b240147b7dc8fa28188064c37e6d6a1194003f3b212e6f086ed0e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 10716 bytes

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