Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fea64dd184abc3…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 06:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 652b609fdc7a839841efa55d9566ba8d SHA-1: 050fd525d84d34e385ada64154b3e6fe5a43f21a SHA-256: e5fea64dd184abc3ade77dd8e620cd6eae8641dc1f7a84287f2eaabb015c8299
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm designed for SEO purposes, containing a large number of external links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs, including one with a suspicious domain, suggests the document's primary function is to redirect users to potentially harmful sites.

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://nipisod.ru/123?utm_term=kuroko%2527+s+basketball+pc+game+free PDF link annotation
    • http://todegapevaja.iblogger.org/kulinisitevowe.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/MShhwhj/real_life_duck_hunt_gun.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/bgfjbBR/19464320558.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/igtYPje/96233738492.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
    • https://uploads.strikinglycdn.com/files/ee8a1ba8-7e2d-4863-b61e-c7c4d5126e5d/tukijunebafujev.pdfIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_ad137c4e31634c01802c21387ed25836.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cb71b4-1e25-4ca5-8ed1-0a416833419e/94187920780.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/water_aid_annual_report_2018.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_723f474b77424ecfa440d988b0e81e1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5a1649-6f5d-4270-a8d6-5aa8b9859430/wd_my_passport_wireless_ssd_vs_gnarbox.pdfIn PDF document text
    • http://tepokubomime.rf.gd/48480850672.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_495e1965d5a74375b11520f928d44342.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_5e5209772e784bb9ac31215181c3c99b.pdf?index=trueIn PDF document text
    • http://fapizof.rf.gd/jomiwaguxukomivokiputobog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73066ff6-e5b2-47e0-b406-67b9856766ab/76385155210.pdfIn PDF document text
    • http://kasisexa.rf.gd/36456084865.pdfIn PDF document text
    • http://zulorokufejepa.rf.gd/58106717458.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_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 5268 bytes
SHA-256: 6bb15456fbd752f8d60994c21664c4b8afe26280a1816f5b6465d6b03386b8f6
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 11100 bytes
SHA-256: 3fb73b40611feb50b30c031a01ab599f1ea29646a4f55f36e73b76436d219f81
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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