Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf99d0033b7d06b…

MALICIOUS

PDF

81.2 KB Created: 2021-04-03 16:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e7a9b5a399cf67b8c07c47ec9a8e9c0 SHA-1: 80ceb9b08953b3c2210ce2a0bb75e0a692148b12 SHA-256: caf99d0033b7d06b42804eb539f02a8d04e12ce706fa51ec5a7e62aa3fcb4493
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=what+change+the+density+of+ocean+water PDF link annotation
    • http://abreudesigns.com/274071936880xv2r.pdfIn PDF document text
    • http://hyipinvest.site/whats_my_love_language_quiz5m7ko.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/air_conditioning_principles_and_systems_pitaboz9m.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/vadepowu.pdfIn PDF document text
    • http://reactivascotia2020.com/free_tilesets_platformerphede.pdfIn PDF document text
    • http://giveaway2020.info/after_effects_free_full_versionuiqud.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/sejeji.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/siruf.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/rafiralexezol/autoestima_unam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13db22f-bf6d-4b08-9db0-b5d2b832e800/whats_the_best_crochet_stitch_for_a_baby_blanket.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/netbeans_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141fbdc3-43fc-4c9f-99d9-f8a09adff9f5/enterprise_architecture_as_strategy_ross.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26740964-f53d-4623-b4c5-3198cd913999/why_wont_my_irrigation_shut_off.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/allied_races_nightborne_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/jimili.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/27641071154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d94e98-5af7-40fb-b36f-81a4da1c92ac/69635525692.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/fundamental_english_grammar_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/fulowibuvareluxotoneniri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfea434-6164-4303-9b04-57516432afb9/17427895409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7622a6f0-d1c3-43bc-8c5d-5c135940e584/50_shades_of_grey_freed_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15501dd3-61df-43c2-808a-3f3b16dd77af/xaxufejabogowikig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c853d5-4621-45bd-9031-010c1b412949/76796966464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6760800-8b34-4cff-9bf3-b2d315d6a136/30009279722.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_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 5460 bytes
SHA-256: 9280d88725d8c42942274af878c1a8d2f654632ea6ca3367260e7f3d38f8705e
font_01_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 11056 bytes
SHA-256: 7a768723f753cd5b91d6377f3c106bb5c67749e40a144e8b2369bf26abc76566