Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2688b3a6a187671…

MALICIOUS

PDF

79.1 KB Created: 2021-03-01 18:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 22ce7c4005c0fd94bddbb5a3a70c89db SHA-1: f966ef4c05a059a8756d2b8a62194cde0c72901c SHA-256: d2688b3a6a1876719ef1f74917dfb947fcdfd30590c8fb5b0e01d3d7cb0e5183
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into navigating to malicious websites, likely for phishing or malware distribution.

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://zajinet.ru/wix?keyword=stats+data+and+models+solution+manual PDF link annotation
    • http://sarhello.online/indigo_boarding_pass_onlinejhndv.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/how_to_order_starbucks_secret_menu_in_malaysiagby2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_6023c3a30c39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_600d3ae7c8035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_5fda4141c9006.pdfIn PDF document text
    • http://umkatrade.ru/romawexajagowidigumeguvk7lt3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5ff1df975f272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_60132c173bb82.pdfIn PDF document text
    • http://importants.space/loophole_song_lyricsgvobb.pdfIn PDF document text
    • http://detonic-official.website/certificate_of_incorporation_delaware_templatecehdq.pdfIn PDF document text
    • http://dfds.in/ernest_hemingway_books_about_lovehvwea.pdfIn PDF document text
    • http://dnepr24.info/exegesis_y_hermeneutica391po.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5fedc3d42323a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_60361dad196fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_601ad20110ed6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://samowegepor.rf.gd/tejibanesibarigekegarute.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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 4976 bytes
SHA-256: 0723be5fcbc89e7e221871c265798da28fbcc506822674c1931bae7314c635b1
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 14116 bytes
SHA-256: 71ba39d41e677724704f8f5cf6f13ca3f665e0e877a4fbb6699d7248f3f590a9

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