Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cef2ebc1a075d32…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 08:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: db3ff4b69cdfca2bf3e616bc2f6214d0 SHA-1: 55fd28935aaafed7bf82f7ecb5f74351dde0c42f SHA-256: 1cef2ebc1a075d32d7fd542f7ce37a8c29af30a77cb77876a75d43dc13d63177
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://vilenefex.ru/wix?keyword=new+york+driver%2527s+manual PDF link annotation
    • http://xufopizaxeto.medianewsonline.com/50339705279.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/nakukomufazuji-sekokixotowam-bemiko-dupogetomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_602f8ee926d32.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/litivezilim.pdfIn PDF document text
    • http://nepifenimet.iblogger.org/the_crown_cast_season_3_prime_minister_wife.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/dodisomimuluvo.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/bevapisomeb_favowuziju_nuxiroleroxo_kobug.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/2406239.pdfIn PDF document text
    • http://ruwegekugite.22web.org/simplified_badminton_rules.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/us_navy_eval_closing_statement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_6015dd3ae0120.pdfIn PDF document text
    • https://patilufadan.weebly.com/uploads/1/3/4/4/134462925/ludim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_60417fca08062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tevefetilojas.atwebpages.com/58724817037.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/davoniv.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/2972359053.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_63285dd8028e4579a577ec03e0c5ec80.pdf?index=trueIn PDF document text
    • http://busapow.rf.gd/sesadefovojobolabelowuzo.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_199898dfdd644246a20775763f06add5.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_c30aaff98e2a4753955be69e634b4c5e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 5092 bytes
SHA-256: b81229e5bf3e6867ab30e55128644680b309b6717ae9ed26c357a4e6f099e62a
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 11296 bytes
SHA-256: 3bd577dad665c22dd3a1b3e343427f1822a5ca8ea9f7f55a91b7aee7f59411c5
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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