Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b679104f90f073e…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 10:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 22fac09e7d91d9d006f869cf43566954 SHA-1: eb62b4ebfeeef2f3d6a2ede23750ceb3f2b752c3 SHA-256: 4b679104f90f073e38322ac964384ee38ca089415283666db79500644c332645
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded links, many pointing to disposable domains or link farms, suggesting a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly indicate malicious intent, likely related to spearphishing.

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://oniceh.ru/pbw?utm_term=how+to+use+a+whirlpool+microwave+convection+oven PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4404313/normal_60b0ac98d6ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_603439d165831.pdfIn PDF document text
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/zolumiminipogiv-pudaveg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_603bbf3936970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454421/normal_6057982ed6c65.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/togesifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_5fe35733a60ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144431295/bineriwawog.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/707861912.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/brush_pen_hand_lettering_worksheets.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144428400/delta_skylar_crib_manual.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144416427/kifababivi.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/numration_les_nombres_jusqu_999_ce1.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144432363/pa_schedule_c_instructions_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d57da13-8300-4dde-ac9a-9163fda40081/gawobura.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/23467806279.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/9244066021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdcdc72-d25f-4831-ab84-b0671ee6b941/zuwawun.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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5288 bytes
SHA-256: 327258196ff85fb859f43b19fa05bd08d68ea8ace8d5b28cd67e910917f52379
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10572 bytes
SHA-256: 3a771be1ae812daa45d48b56fdfb0095622644b74a2e02fb66eaec75d8d953ea

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