Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd977d778fc7835…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 21:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 61a3f6abdf4472694b11a3f3cffbd835 SHA-1: 1902f728e150d493e952010082d03fb35a8f9649 SHA-256: 6fd977d778fc78350e21bd583973058edf356a6c5ef06a09d2b6d0bfa50be311
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=bose+companion+2+series+1+review PDF link annotation
    • http://xitabijasava.getenjoyment.net/73632062569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_601ecaff544ae.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/ccc2ae15f681326.pdfIn PDF document text
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/watekazariw.pdfIn PDF document text
    • http://nutapobo.iblogger.org/bluebells_of_scotland_trombone_solo_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fff9babb4382.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/95000833747.pdfIn PDF document text
    • https://mezemefi.weebly.com/uploads/1/3/1/3/131384279/dukit_mevamekipoturew_sirepavabekir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_60044c3be283e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sodarag.epizy.com/vodafone_connect_app.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/kaspersky_antivirus_2019_apk.pdfIn PDF document text
    • http://zujamovosologu.rf.gd/16752467021.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/sentry_safe_model_number_tc8-331.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/brain_teasers_worksheet_answer_key.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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 5432 bytes
SHA-256: 70bcfe083d62a453aad37dc6539dea27483571032ae0055a066cc09ce11464e3
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 11348 bytes
SHA-256: 632495db9c360f3a8fc56fdf1abd8ea3ddce755edf3134399c760e77b69c9204

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