Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b7702acdd20781…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 19:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 63918697c29e32f36c6771a6537894d6 SHA-1: 0d94844df6a20c145ea73650d55387031162b8c9 SHA-256: f5b7702acdd20781118f81193dfc330684a12fd6b0ea351810551c4daf3d36cc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://zajinet.ru/strik?utm_term=easy+guitar+riffs+for+beginners PDF link annotation
    • http://verifybadgesbusiness.com/bratwurst_and_potato_sheet_pan_dinnery8n3y.pdfIn PDF document text
    • http://itmax.info/wogibemulofelotifu7qpnn.pdfIn PDF document text
    • https://cdn.sqhk.co/neruxojus/N4gjQih/sugopixepazize.pdfIn PDF document text
    • http://albl.ru/573437867985kke4.pdfIn PDF document text
    • http://mesretly.xyz/rofikixenaxi2uqk2.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/ghmYjf6/an_inspector_calls_revision_guide.pdfIn PDF document text
    • http://habercigo.com/27964145248yzy19.pdfIn PDF document text
    • http://copyright-rules-help.com/amapiano_dance_tutorialftjyk.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/hgjjZhi/19211300465.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/XUhbijd/9th_class_admission_form_bise_lahore.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/0gj8wjf/ally_smash_player.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/mCXieTC/farm_heroes_saga_grass_seed_levels.pdfIn PDF document text
    • http://gradstroy.su/kedenexumodemqsnz.pdfIn PDF document text
    • http://prizinsta24.space/what_causes_lawn_tractor_engine_to_surge8sou8.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/igjpC1a/jlc_reverso_classic_large_small_seconds_review.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/hAghnib/popular_hashtag_producer.pdfIn PDF document text
    • http://moscowflowers.shop/logitech_x-540_release_date2gz1r.pdfIn PDF document text
    • http://ses-paypal.com/353562683hws2l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db3ee22-456e-488d-801c-860b9ca3061f/80258804126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001ad305-f3c1-4c00-9f5c-800368a03191/how_to_find_probability_in_biology.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_15dbf25aad164afa81f79859345d5c1a.pdf?index=trueIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_f81c2a3e378b48a0915238305518421a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c67d2cc-f347-4b9b-94fa-8e1fb4479c48/is_there_free_will_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0dbbd9e-4f23-4728-a935-19d6db519237/biwiwukesoriwijebupad.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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 5100 bytes
SHA-256: 2672f577f89f35b86dcfcf9a14cca11a569bc6c88ab3a167256f7b0b8a885fff
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 10500 bytes
SHA-256: a13c95ca6b948c6a609786eb739ebe3824a3a8e2723e29ce2c6f25a6448aa48b