Malicious PDF — malware analysis report

Static analysis result for SHA-256 872187ef7c910c7e…

MALICIOUS

PDF

86.8 KB Created: 2020-12-21 12:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 618cc86f35af6a577836009b348864d1 SHA-1: 19f7bf9dc23e5f51ec718322af7eef39a08ce8a1 SHA-256: 872187ef7c910c7e85ef2dce5baa26e027709e62882754f50ddc4f77b5345e7f
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 0.9998

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://trafffi.ru/strik?utm_term=j+craft+truck+bodies PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5fd08fb2cbbb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fc6a442e911c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fc1843147423.pdfIn PDF document text
    • https://pixijitawe.weebly.com/uploads/1/3/4/5/134593468/4461972.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/lovew.pdfIn PDF document text
    • https://lijujizakivim.weebly.com/uploads/1/3/4/6/134634855/9673166.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/8620865.pdfIn PDF document text
    • https://dokosoberodato.weebly.com/uploads/1/3/4/5/134597138/vodaxatifex_wibiji_duveneri_lesojitozam.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/385bcd82ba60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fb910f3d8de2.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.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/tufujifinobiro/sperry_vd6505_user_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc006d0104edf1d777bfbd4/t/5fc112775147b1480459b0a8/1606488696149/60394242754.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/berivenu.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/anexo_ii_simples_nacional_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/sorofi.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_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 5176 bytes
SHA-256: bc6dcc1f512929bf99e91bcf58c9163b64479c481ae616046a16045d8d815ca9
font_01_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 11256 bytes
SHA-256: 924986906938b6833aa024b8a06693e00091e32460c0d6a0d0d0890d900ef753

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