Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afbf56f90609a59…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 18:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8f61987121cb21f63abaf27fce69d4be SHA-1: de96f0dff1e978c4de62e2b5367325d7d0ee63aa SHA-256: 5afbf56f90609a59d3f66bbe4f755bd16e5de420301db9d33fc378d8c0bcc2d2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/123?utm_term=army+code+of+conduct+training+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_a9fab998e2b84c0897a2e2dad6d15399.pdf?index=trueIn PDF document text
    • http://kokomato.epizy.com/64626373238.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_e5e451f3249541b18530de52ec133895.pdf?index=trueIn PDF document text
    • http://dijemawijopetu.epizy.com/suresujunudojuduvux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a1bf45-fdbb-46f2-8273-8bc0675b56ba/dejadujizuwibit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07901ccb-47d3-4f65-8cc1-80870eff07b2/luluxuvurog.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/2018_sea_doo_rxt_x_300_owners_manual.pdfIn PDF document text
    • http://bubewap.rf.gd/sifozitudofub.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_e326323757ac47bcb2a501e02fd529f3.pdf?index=trueIn PDF document text
    • http://kusilip.epizy.com/14598206976.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_dc07502efcdc49d193914e43e04aa86d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e1b530-5d22-4284-895e-85db415d5265/dijunotalojazunuwanor.pdfIn PDF document text
    • http://movafomuwexowix.epizy.com/zevufufanujesenovadudojul.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_79d77cdf8ab34b33900a0e9670fb9f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dabc1e7-b972-42e9-a051-cb1ee6d751da/surfboard_sb6121_ip_address.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/73741115356.pdfIn PDF document text
    • http://jefusebu.epizy.com/23629975756.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a390a9e95d8149ad9747786ecbd76d28.pdf?index=trueIn PDF document text
    • http://kudogal.rf.gd/gibozirepudulibo.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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5492 bytes
SHA-256: a84e3881cbcc28f6c25c4adec0e20ffb4b8e7dea66b4f4f87c21373eb7f74d03
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10404 bytes
SHA-256: 084a984fe8d87c3af593092a0032b6932ca974c71ec55ba69e9169748671ed29

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