Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ab4ae063d5fdb5…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 13:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a4df30e597f7476e4e9f0bb223313664 SHA-1: e8c019ec363038044c4b419e925ce05e5925ddcb SHA-256: 13ab4ae063d5fdb5cca81d0d48be48ebffd3da65b69c10b557b767581880ef63
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://kuzutuzo.ru/strik?utm_term=que+son+los+valores+y+cuales+son PDF link annotation
    • http://koolmaxt.online/volar_sobre_el_pantano_librohlyu5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_601a630ade50a.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/theseus_and_the_minotaur_hades.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410199/normal_5ffa78926e4bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5ff618d7b1b17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe196b221492.pdfIn PDF document text
    • http://dreabling.online/how_to_change_a_primer_bulb_on_a_husqvarna_chainsaw9cg1w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_603f61f3130fd.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/apc_be550g_ups.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_6024f32b8af3c.pdfIn PDF document text
    • http://tipografiyav.moscow/5_barriers_to_effective_listeningdpw91.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/bop_it_xt_instructions.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/fomaralunex/hypoglycemia_in_neonates_guidelines.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/how_to_find_the_mass_of_a_compound_in_a_mixture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49c6da6-5754-4a61-a176-65cd0558eb20/48363880627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a572f6-3245-4798-a959-140243e12d1d/how_to_live_a_peaceful_life.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/62260961828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd34f669-d460-4232-8f5d-52e9958ac326/siwumivebuvotogav.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/daxotuxuk.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_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 5016 bytes
SHA-256: eeaf50b40e5e797eca1fc40f3e64444da64093b6ed1f53c29ee137afe90894fa
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 11768 bytes
SHA-256: 89ee015fad5f7bf84a13859df4f7997c32e66b26321a866d5863228e29d79f46

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