Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a95566d99988a1…

MALICIOUS

PDF

96.3 KB Created: 2021-03-28 08:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 903de0a35fa93619e4f6dc3a749c3c7b SHA-1: 9aedf14feac71fd2713d09289d5b5c152ce1a458 SHA-256: e3a95566d99988a1ed6425264bb411e4cfb5c86745799eb6078d4bcea0cef5a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO tactic or a distribution point for other malware. ClamAV detection and ML classification further support its malicious nature. The primary attack pattern involves directing users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/award?keyword=like+us+series+pdf PDF link annotation
    • https://cdn.sqhk.co/domuzusud/uibR5hd/67620100862.pdfIn PDF document text
    • http://bafafebere.iblogger.org/statistical_methods_for_rates_and_proportions_download.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/aptitude_formulas_for_interview.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/bBKYggt/average_age_clash_royale.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/jjpigid/15423750490.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/6YB28k1/42118762700.pdfIn PDF document text
    • http://loturedozen.22web.org/23331216881.pdfIn PDF document text
    • http://kurutog.mygamesonline.org/canine_distemper_in_dogs.pdfIn PDF document text
    • https://pexivepod.weebly.com/uploads/1/3/5/3/135346377/vewomusefolap.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/fovubudelugilewodo.pdfIn PDF document text
    • https://cdn.sqhk.co/zokirafuka/hfMHJck/41098268474.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/htWif5x/domino_s_pizza_palm_desert_country_club.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/can_t_hurt_me_summary.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/9412423.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jcxgcha/94912467386.pdfIn PDF document text
    • https://nidetufuw.weebly.com/uploads/1/3/6/0/136097009/welivoziz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/20320284218.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/counter_strike_1._6_online_hack.pdfIn PDF document text
    • http://zubulunijegi.epizy.com/lejowo.pdfIn PDF document text
    • http://xazawipobu.rf.gd/24306367614.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/char_broil_grill_recipes.pdfIn PDF document text
    • http://bagasukozu.rf.gd/systematic_review_and_meta_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/where_to_donate_womens_clothing.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/peer_gynt_suite_no_1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4B 4800 bytes
SHA-256: 80da19176e90b5f2c45819bcd1f7f83b5fffc571621c2b0a92b62ef4896acdc6
font_01_sfnt_off00014db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB7 10796 bytes
SHA-256: 6567ad73272d20533ede521f9142ea9e9785a3b626ff8f629099bb3ae3e7dea4

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