Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef131844965d0f1…

MALICIOUS

PDF

83.4 KB Created: 2021-03-28 08:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 59fb40b74c0e7a7aeb38ef0b92ca2909 SHA-1: 854b64feb37c1abfd43189b8be6b46713fb7305b SHA-256: 0ef131844965d0f1bbbd7faedee629f6267a69de9e284f57dbb5aa0e5c674b44
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the overall structure point towards a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=tv+pilot+scripts+wanted PDF link annotation
    • https://cdn.sqhk.co/fukonovum/hfidLUX/43673600518.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/ehgwSji/femesokivupox.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/gfGhd6j/pewdiepie_world_download_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/jgTy1ic/dokadegenul.pdfIn PDF document text
    • http://pc-remont.website/get_followers_on_instagram_for_businessrstah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_603c417bb2491.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/0jgnPjf/tegawogetalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_602ad122eec92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_603ea161c1d6d.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/evgihjM/dragon_skyrim_weakness.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5fdde3c972b5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fc6978d18589.pdfIn PDF document text
    • http://zowefokixot.iblogger.org/adobe_acrobat_professional_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/ljjid1T/girefomesuravisusagufis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5ffaa711e60d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5fcad2a86f0ff.pdfIn PDF document text
    • http://reliables.ru/what_size_battery_does_a_g-shock_watch_used25uu.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://midupebuk.rf.gd/comparison_paragraph_examples.pdfIn PDF document text
    • http://venupelaz.epizy.com/stopping_by_woods_on_a_snowy_evening_explanation.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_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 4956 bytes
SHA-256: d1d4e82f8d49a9af0b822619191a67dd7e8854e37286c8b88d830b1b088ec28c
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 12632 bytes
SHA-256: edd8fed7910e8e2f71b5397f90f5a9bbca7df249e57509b87fcbc7e6d4119864
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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