Malicious PDF — malware analysis report

Static analysis result for SHA-256 7353b6e56a42faa5…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 13:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6ff24c4da2a153ece0722faf31ffb347 SHA-1: e18ff7e006b284299472a08d97a5b2d1ea9e5501 SHA-256: 7353b6e56a42faa57b7828e3bd71bef860f54374f875c9896fadfb86174e357f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=flowers+for+algernon+theme+song PDF link annotation
    • https://cdn.sqhk.co/fakomuse/hbwhfia/78859480552.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/litizemexog_xegevuf_xatamup.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/1239f45.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/mANhbhc/consumer_reports_magazine_tv_reviews.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/zuradegijiw.pdfIn PDF document text
    • http://tefosewun.22web.org/bushnell_neo_ghost_price.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/vghidbK/outliers_book_amazon.pdfIn PDF document text
    • http://rerokofige.iblogger.org/mobujegapani.pdfIn PDF document text
    • http://faporivifavavep.22web.org/caveman_diet_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/kheIWhi/41089310406.pdfIn PDF document text
    • https://cdn.sqhk.co/zarudaletok/ehfCjjc/faith_family_medical_clinic_arlington_tn.pdfIn PDF document text
    • http://tukakesafaj.iblogger.org/xigamufalavamajefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisidop.rf.gd/calculus_and_its_applications_9th_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/senufixapafepiboxetonaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/bts_run_ep_13_eng_sub.pdfIn PDF document text
    • http://tazefuwavubu.rf.gd/simple_past_and_present_perfect_worksheet.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5228 bytes
SHA-256: 62e7c3fe6930e28b07e5907ded315cd81216c619309aa28e6cbe5383766a083c
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 11424 bytes
SHA-256: 014a99a5114fb5210ceb1ccd20ac197eed0f50b8e7c2d6c51201bf4c4d1d89bb

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