Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5814c5791c871…

MALICIOUS

PDF

82.9 KB Created: 2021-03-16 08:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 412da840accbbb4c48571032bc691aea SHA-1: f626f9d8dbc01ff25950853652822fb909b2181b SHA-256: 18f5814c5791c871c6bc5696191c0f762e43cc6d625752316fc1d62f1b911198
146 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. Heuristics indicate it functions as a link farm with disposable hosting and contains a callback lure, suggesting a tech-support scam or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent.

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 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) documents that carry no urgency or charge/dispute escalation.
  • 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://xajibur.ru/123?utm_term=chartered+accountant+cv+template PDF link annotation
    • http://xitnet.fun/kutizeve3y4n2.pdfIn PDF document text
    • http://eurozone.pro/beethoven_sonata_10_violino3vy8.pdfIn PDF document text
    • http://nosatines.mypressonline.com/6589476351.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/wudonukuwamovu.pdfIn PDF document text
    • http://idealicaitalia.website/gebezemukepokosotuwokakel5znko.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/1489847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivekovojador.epizy.com/technology_in_construction.pdfIn PDF document text
    • http://kozamigovato.epizy.com/xavasiralofomajuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57479141-abaa-455f-9e2e-8e2c70345e92/lukus.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/17488536953.pdfIn PDF document text
    • http://gobiburitumeri.epizy.com/peter_jackson_s_king_kong_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72801544-d490-4a04-bed6-5f9d2b9c0549/how_to_buy_and_sell_penny_stocks_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23bcbdc-4eed-419f-9e9d-951c8aed4295/21756922658.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/faseminavipusavelub.pdfIn PDF document text
    • http://xemenorusameker.epizy.com/58631627771.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/69459858042.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/lewaxigorafel.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/arithmetic_progression_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98941f6d-99db-4ae0-ab11-82869017e7f8/how_to_store_ironman_inversion_table.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_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 5100 bytes
SHA-256: a61fc1581d80cb55bed32573bd0e7ea7c69e4379846b7f962c357d4e67eb9097
font_01_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 11216 bytes
SHA-256: 2ccc7d52ca48ecc0e0ca5d1eb1ea9a4de98faf8eeaf0d2ea690e8903ac51023a

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