Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84be4f1c5904130…

MALICIOUS

PDF

75.1 KB Created: 2021-02-13 01:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83d17dabcfe90aca475a24d0be6556fc SHA-1: a4a2fc72dea6c40982ae1345e55ef029d169e574 SHA-256: a84be4f1c59041304bf06d455545a1d78b63fa1f0fbaa0f97526ab91fe20337f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate effort to create a network of deceptive links.

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://jottigo.ru/wix?keyword=hbr+guide+to+managing+up+and+across+epub PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5feeeee271189.pdfIn PDF document text
    • http://sotovezi.22web.org/copenhagen_airports_denmark_aps_annual_report.pdfIn PDF document text
    • http://detolenikalopaj.iblogger.org/mariah_carey_without_you_piano_sheet_music.pdfIn PDF document text
    • http://walletelectrum.buzz/zumagodaxopefa16yp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60124c9529528.pdfIn PDF document text
    • http://livecopyrightverification.com/799367202191jn66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_5fd63eb9da92d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_601ed5c60e5db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fde222f2032f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_602115ab23b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_60222a70ebaa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_600016b310fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_602630dec4962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_60258be9ae929.pdfIn PDF document text
    • http://makamar.xyz/kuwokojefakitixlv0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/loluma.pdfIn PDF document text
    • http://lojizigakuxit.epizy.com/judezasozotubawote.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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 5460 bytes
SHA-256: 8513efa470878db55312ff95d4d58d7ae29e6e869df6dc256c1c042f50041355
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 10572 bytes
SHA-256: 5fb1026dd8963d6d6cbe10c22ea858dc858d5f679ae9e44a8a77032c20e03646

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