Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4173472cafc97d…

MALICIOUS

PDF

80.7 KB Created: 2021-02-26 20:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c811443101bffef2398e4f027508dd4 SHA-1: cdff2ce0421c1ed3702c71cb9aa8c1217655a181 SHA-256: 7c4173472cafc97d9b5c3d0ff695e129f51fb685bb14c037fd11a1a604065c5a
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=samsung+blu+ray+player+bd-jm57c+remote+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377656/normal_601e115970c09.pdfIn PDF document text
    • http://nejufez.22web.org/cuantos_metros_mide_una_tarea_de_tierra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405430/normal_5ff2109b11bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_60249a10dc694.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/khaiagg/27803171535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_601fb7fd55717.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/hdwhcjj/stickman_dismounting_2._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_600ea02974e1d.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/H7gjhcR/wood_carving_kit_canada.pdfIn PDF document text
    • https://xokizaneg.weebly.com/uploads/1/3/4/8/134886830/sikiwafuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/Ngghbjd/mujadozududagegeratefag.pdfIn PDF document text
    • https://sitekitenuzuvi.weebly.com/uploads/1/3/2/3/132303150/xedax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fdfcc9c8c546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449004/normal_5feb5e0dc5f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457332/normal_5ff0858f4df83.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/603f355.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/xaliwalufoguni/information_retrieval_methods.pdfIn PDF document text
    • http://safefimij.epizy.com/77755853995.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/74931352517.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/96563083063.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/jakidiwefuxixasufukad.pdfIn PDF document text
    • http://lulanikigog.epizy.com/answer_to_thank_you_so_much.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 6048 bytes
SHA-256: e9a97cf3f219cae980874aa5889d3f0a256d0379ac23e01a73fc1d8221484ccc
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 10364 bytes
SHA-256: e0ab10f0ba764508c6fed36f6409c4b67ebe75c4c00a99c0c2a5be50da49bc6c

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