Malicious PDF — malware analysis report

Static analysis result for SHA-256 541dad30ce72bcdd…

MALICIOUS

PDF

76.3 KB Created: 2021-02-22 08:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80523b8f3177418f4461d16173b689f5 SHA-1: d9d572811500309cb2f81bfdedb931db53bf25b8 SHA-256: 541dad30ce72bcdd0497dcd810dc128153e3ced274102ca91067a0926d09775e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=gcf+and+lcm+worksheets+pdf+with+answers PDF link annotation
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/ropida-jejevufumaf-dejupuxekimewi.pdfIn PDF document text
    • http://tevojagi.iblogger.org/fefabopubuduzater.pdfIn PDF document text
    • http://juilopkiretlo.ru/85361064365mwuvy.pdfIn PDF document text
    • http://keto-menu.online/tasopewetov5vcbe.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/6958390.pdfIn PDF document text
    • http://zuwodaxa.iblogger.org/que_es_un_retrato_explicacion_para_nios.pdfIn PDF document text
    • http://naturfresh.space/dead_space_infector_death8z1cs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5feb6781917e3.pdfIn PDF document text
    • http://normaa-id.com/magic_number_7_plus_or_minus_2uj65x.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/bolawizizose.pdfIn PDF document text
    • http://mosquito.codes/libro_de_kamasutracbb6b.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/dinigugaxej/wamozeninar.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/420131737.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/dota_2_beginner_support_guide.pdfIn PDF document text
    • http://diturasenupope.epizy.com/rafupifubovuxawak.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/3940931873.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/prentice_hall_algebra_2_with_trigonometry_answers.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_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 5584 bytes
SHA-256: e05ef3d10e8ae6865c17b0f1ada8dfc06150a4f3a206353e7694a67567cc00cb
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10900 bytes
SHA-256: 6c9d0adefc9cde0a7fdc3eaadef5f43a71b3e5e5fad7013d835cee4bddd6f16a

Open this report in the interactive analyzer, or submit your own file for analysis.