Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdeba664f1fbbfbe…

MALICIOUS

PDF

73.2 KB Created: 2021-03-22 20:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c8d1627b245bb37c2f3a7e04791ec21d SHA-1: 32054ebe1e91d6339897f9df052e9471cfb0579a SHA-256: fdeba664f1fbbfbe59fc91affc25c8aeb2f4464d9ed1a1f28712a4ce36800311
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains an embedded URI pointing to 'nipisod.ru' which is presented as a resume design template, a common lure for phishing or malware delivery. The PDF structure itself also exhibits characteristics of a link farm, further supporting a malicious intent.

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://nipisod.ru/123?utm_term=resume+design+templates+simple PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426942/normal_600dfe9ba7bf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5fd091e70084c.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/amino_acids_protein_hydrolysate_davis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_602ce56bbbecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fdc495529b50.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/budawigowifut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_a3069c20bdf849b2bed8438f96ed6f7e.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_f782100817bc4e85aea9d76dae619fc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0d8006-922e-4f70-9891-8904c7ca99b2/17238768878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c84ad0-1efa-4b7f-914c-3721fc123f6b/56776097018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02c7979-3907-4bf8-8613-e517c048839d/how_to_sign_up_for_staples_rewards.pdfIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_363b95ac46534bafa10fbd3532b78d9a.pdf?index=trueIn PDF document text
    • http://ruwejux.epizy.com/weather_report_franz_josef_new_zealand.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/scientific_hindu_astrology.pdfIn PDF document text
    • http://tibobabinenan.epizy.com/98691219299.pdfIn PDF document text
    • http://dopapaxejoj.epizy.com/17063994248.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_33747c35a55d46108439b2e9f351cad4.pdf?index=trueIn PDF document text
    • http://gumizaxewa.atwebpages.com/velivov.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 5188 bytes
SHA-256: b6849b7fbb57760787c857c322a181b6460a515d0e9e985ef458355e802d7ecc
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10800 bytes
SHA-256: be57a0b7d924483bc08205ef0213a7c59c5d7da79e1ec527ceee58fb6ab3373a

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