Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1e42bb6a23480…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 12:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 068c2da53f0dd4ffb767c8a8bf97bad0 SHA-1: 22cfaaff8794c1c5cea62ef37216a213fb3d5096 SHA-256: bca1e42bb6a23480bc02b0fe893042de6a1afc498afad2172d99c50e7c973644
244 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of embedded links, many of which point to disposable hosting or redirectors, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+strengthen+the+gluteus+maximus In PDF document text
    • http://talebakela.iblogger.org/picsart_apps_free.pdfIn PDF document text
    • http://guzolupe.iblogger.org/malubarutusif.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/3Ohfsgf/vokurez.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/tegena.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/vekowusabamujapepa.pdfIn PDF document text
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/xufolujiref.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/3797753.pdfIn PDF document text
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/aaf2db9a6a4e1.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/26550132085.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/ieHyOn7/wowubikagereriger.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/ibhf6Tq/tinujunovukusitatesi.pdfIn PDF document text
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/5097932.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/5637440.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/cloud_computing_examples_website.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/tjiOihD/disney_store_marvel_masks.pdfIn PDF document text
    • https://waxopudiva.weebly.com/uploads/1/3/4/6/134695928/safobaku_doworelup.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/gdhhZ6v/knights_chronicle_amon_rune_build.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/analytical_mechanics_of_space_systems_4th_edition.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/kizexer.pdfIn PDF document text
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/22370d204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/relotazexolusu.pdfIn PDF document text
    • http://pelasezota.rf.gd/adjectives_and_adverbs_worksheet_grade_3.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/33694465746.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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 5220 bytes
SHA-256: 03c79fa9a76d886c989eccca70af140abb15a2eae79055c00ec2b66af3d35c8f
font_01_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10664 bytes
SHA-256: 27b45d3d96dd86cedb8508bdffb0dabf8cd2c76b11fca39b832ab3b2e32920fe

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