Malicious PDF — malware analysis report

Static analysis result for SHA-256 968f6eaf4ecfeb32…

MALICIOUS

PDF

99.4 KB Created: 2021-02-10 23:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 12bc2026c9490f578f0dad56442aa0a8 SHA-1: 1675e34d37abd7bb87f46572161c88d19864e7f2 SHA-256: 968f6eaf4ecfeb32b731a618670d66ec968c6198f04020ecab3f30200cbd431d
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 hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

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://bologen.ru/123?utm_term=thunder+god+vine PDF link annotation
    • https://mugunujepigujov.weebly.com/uploads/1/3/5/9/135992134/1267236.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/dljchfe/nawewazona.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/ejfgepX/car_crash_simulator_extreme_derby_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fda495a9cff0.pdfIn PDF document text
    • http://gebatuvarak.66ghz.com/lacrosse_stick_sizing_guide.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/sonobasot_xurodi.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/zivutopataluri_togizunuvagemib_muxedagegetow.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/tuwunopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/swayam_online_registration_form.pdfIn PDF document text
    • http://ruvibeli.rf.gd/cloudformation_template_vpc_endpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/54115498723.pdfIn PDF document text
    • http://lujonas.rf.gd/adjective_and_adverb_worksheets_for_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/ansar_sheikh_marksheet_upsc.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/bibubudogidexuv.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_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 9080 bytes
SHA-256: 96413b5c2944c385e18b1bbd640bb9d7f456dfe538233c881b71a15479461b7b
font_01_sfnt_off000148a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A4 4676 bytes
SHA-256: 782c9a2d8616701ad49f43ce8e9326b5ec8c27f40d3f973d4f337fe6c54d598f
font_02_sfnt_off00015889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15889 12268 bytes
SHA-256: 57886052b1b8be11ff68be3106f1d72beef2e5bd2e49a366671e6a8acfd8563e

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