Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6dbf5d25d368a4…

MALICIOUS

PDF

73.7 KB Created: 2021-02-06 06:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 84ca1502310a3e3b1b6500f7567066de SHA-1: d6c7087712dace2c9bd80fc7853073644025f229 SHA-256: fa6dbf5d25d368a4b0260aa048dd6decae7b74f8e581fd9b7e7d357061cfef3f
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to attacker-controlled infrastructure.

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://seumenha.ru/123?utm_term=mountain+bike+fenders+29 PDF link annotation
    • http://keep-travel.com/teacher_guide_grade_9_physicsfl24l.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/YYpgchc/kizokerutelesad.pdfIn PDF document text
    • http://tricitysikhs.com/zumoxugifijubitijijozuxl5x8q.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/ejhHi5s/breakfast_cooking_food_fever_apk.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/lapemewejotipeguzipew.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/Kfihyie/82162150610.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/katujopamipatopoferuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tekunobujolid.epizy.com/wedding_march_trumpet_sheet_music.pdfIn PDF document text
    • http://joratunezawaxa.epizy.com/coat_of_arms_shield_template.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/moratige.pdfIn PDF document text
    • http://gujupikisikali.epizy.com/91062198253.pdfIn PDF document text
    • http://zekubegem.epizy.com/ib_french_ab_initio_syllabus_guide.pdfIn PDF document text
    • http://xuresiru.epizy.com/mifut.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/das_attentat_sarajevo_1914_film.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/kukemirufonevim.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/komplikasi_gastroenteritis_akut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 5248 bytes
SHA-256: d496b783d845bd09c7fd2def58250ce3725f809c08969544fa781e8ce2cd5a00
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10288 bytes
SHA-256: b24beb550ba1bd278e99e9c8a12eb86e03c217812871d7dff8f3a37a0c88d93e
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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