Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c4b201bc5d5f2a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-26 05:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d707ed7db66dec9d7b829c655666b08 SHA-1: bb684459c947b4e048178a6e6584c5d25fd997b2 SHA-256: 42c4b201bc5d5f2a8a705ef93e00ad243b277790b2c38e781e4153403516c0a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially malicious or unwanted content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=the+things+we+carried+chapter+1 PDF link annotation
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/5f46f21c6c9d45.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/ed181.pdfIn PDF document text
    • http://invitesistem.ru/where_are_first_alert_safes_made7sfuq.pdfIn PDF document text
    • https://puwekuzegavezek.weebly.com/uploads/1/3/4/7/134734886/jatob.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/4154620.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/8a5f918c277d.pdfIn PDF document text
    • http://noxogejukebe.mypressonline.com/31663012465.pdfIn PDF document text
    • http://sallehq.xyz/pretty_little_liars_theme_song_youtuberzuhe.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/goludavuxogapa.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/5328344.pdfIn PDF document text
    • http://womans30planet.com/25352174662tolsk.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/e0582d2d-ddcd-4f73-9ee1-af6ec465a603/10324852170.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/mateleran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1138d02-c0a0-436a-aeaa-6625255ce01f/tokugigikeraxese.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/addis_ababa_university_electronic_library.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/lineba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f5770f-fb4d-468f-9114-7c66a5283aa6/how_to_feel_better_after_binge_eating.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_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 5396 bytes
SHA-256: 87f8b7c2c9057b19e936ec5b1b3d83777d09182e0401e037cf811b6db6bea144
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10800 bytes
SHA-256: da624ec8226d66cc17e0cb50b9d9345f27a17a7ed995fc3caf661855aaf16373

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