Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da73d9ca298ce28…

MALICIOUS

PDF

70.7 KB Created: 2021-03-24 11:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd7680b6460906573ca11180655d8a21 SHA-1: 50cd3422213ab6ce89deeef24bf9f5eab11afc3f SHA-256: 6da73d9ca298ce28aa0da2ad83d122f9f1e17a7f41e040b5b40595f2cd18cb95
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external websites, with one URL identified as a potential phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=www.adams14.org+infinite+campus PDF link annotation
    • http://dlkmvkoenv.info/38747931594gus8t.pdfIn PDF document text
    • http://13millions-warzone.store/50202172540mg0fc.pdfIn PDF document text
    • http://salleapp.xyz/closing_the_gap_report_20076324b.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/atomistique_cours.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/lelesabila.pdfIn PDF document text
    • http://mamontov-net.cc/23109201546vznv4.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/dosoxiz.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/zusevamasor/microsoft_certification_path_2018.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_565b4bcddf75477d8bcf0e4f6e8ff183.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_95dc50401b83441a9b15b8581a17bf33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/global_marketing_keegan_green.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/selole.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/list_the_5_relationships_of_confucian.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/6th_grade_math_workbook_mcgraw_hill.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_775c1c1522a5421ba5f786dd466b9e91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d728db83-464b-4c1a-8c44-396692f02de2/painting_with_a_twist_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/6273438582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9843e7a-dcd4-41e7-8214-b87ef43311a1/masitibagoxuvedifapom.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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5720 bytes
SHA-256: 799a91410870b58ed93081a6fd9fb5cd7f9ed86355de04a98c7714dbde5589fc
font_01_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 11772 bytes
SHA-256: 2e1126c56880fc9f61e19dd93a4b406d37a7301265e7d26b8714522e5ff32a6d

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