Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04dabd72d9219c4…

MALICIOUS

PDF

123.9 KB Created: 2021-03-22 21:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eec182b6060a96cd84c763e991c58b35 SHA-1: 18baf8d6c9191bc7e780a95f419038e0051e2841 SHA-256: a04dabd72d9219c4aef89cb4b287caa5b9100caab6fa0c9496c55af5b804ae55
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting and likely part of an SEO link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lozipotod.ru/award?keyword=abelian+group+examples+pdf PDF link annotation
    • https://xojurumute.weebly.com/uploads/1/3/5/3/135328527/8d4b31fa24a5.pdfIn PDF document text
    • http://reliables.ru/fce_practice_test_with_answers_online5lhsf.pdfIn PDF document text
    • http://steblin.pro/how_much_was_rent_in_the_80sming2.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/7607100.pdfIn PDF document text
    • https://ribimefisele.weebly.com/uploads/1/3/4/5/134516567/jufamex.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/3Fjfide/royal_caribbean_cruise_line_jobs_salary.pdfIn PDF document text
    • http://moreprodukti.com/mogubabis75ary.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/Vibjhgj/64482738360.pdfIn PDF document text
    • https://vebovaxuzukikom.weebly.com/uploads/1/3/4/3/134352383/b46855b065e33b.pdfIn PDF document text
    • http://vclean-sale.shop/joratoxedupojupiduiockj.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/arabic_to_urdu_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/gggEibd/81488269996.pdfIn PDF document text
    • https://zerivomixiloz.weebly.com/uploads/1/3/4/6/134664353/9a708e17175.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/4037108.pdfIn PDF document text
    • http://teleporttur.ru/53763327256f036r.pdfIn PDF document text
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/6590528.pdfIn PDF document text
    • https://cdn.sqhk.co/wajinevisu/o0jiepS/woodshop_diaries_youtube.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/sugedodevi-kagibezof-zabudona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojogoralil.onlinewebshop.net/how_to_install_a_furnace_filter_whistle.pdfIn PDF document text
    • http://pojesonedako.epizy.com/kogojebomufufadorozepoza.pdfIn PDF document text
    • http://bogadigoxizalux.epizy.com/square_root_of_204_in_radical_form.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/cuatro_formas_de_comunicacion_linguistica.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17737 4884 bytes
SHA-256: d71bffbdadadc9c74ef541b212805a33127091d4433b0c6699499489831a9e1b
font_01_sfnt_off0001888d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1888D 5556 bytes
SHA-256: 068592794c229772091964c6d70900630216c77767738109110dc7737fc061ca
font_02_sfnt_off00019b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B61 13996 bytes
SHA-256: 478ce9316c6209835c9a43bd4b0ee4c4d7676839a324d62e9325b36ef39acd33
font_03_sfnt_off0001c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C85D 16968 bytes
SHA-256: fba584c7117bd6a77c7af021b4869cf77cee698cb44228112fadfec0c1d03bf8