Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9933c5c1c3c0ea5…

MALICIOUS

PDF

77.8 KB Created: 2021-02-26 07:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84f89459168ff09b5e79b0fee766e5e7 SHA-1: c585da1aa1d8885a6203ddf41fd3338653842b61 SHA-256: b9933c5c1c3c0ea5ea963c343010594e9cb7bdbb2b51526fc8c1f2a05846b4da
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=guild+wars+2+level+up+guide PDF link annotation
    • http://gisoboxizaza.mygamesonline.org/lasko_high_velocity_blower_fan_cleaning.pdfIn PDF document text
    • http://birjand.design/startup_pitch_presentation_format82hwc.pdfIn PDF document text
    • http://rasazevedip.22web.org/core_du_sud_guide_voyage.pdfIn PDF document text
    • http://begemot.space/gegugipmmq2.pdfIn PDF document text
    • http://rmk4sale.xyz/91127412086tq4xt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fe7a905ca3df.pdfIn PDF document text
    • http://white-x.fun/rilenz93z3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5ff26f16de3ea.pdfIn PDF document text
    • http://life50it.pro/sasodipovewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_602c602ab69e4.pdfIn PDF document text
    • http://gprofights.ru/52461974831w3qxf.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/46686988044.pdfIn PDF document text
    • http://harmony-market.ru/john_deere_212_snowblower_manualt3gen.pdfIn PDF document text
    • http://powerhdniy.space/translate_canvas_reportlabd2gp8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fdf00f961bb6.pdfIn PDF document text
    • http://usesoda.pro/999219568785ygrz.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/puvov-fevelukomuxir-xojofava-maxusesezadu.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
    • 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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5028 bytes
SHA-256: 7326fe888c7ddfeefc2ad09398c7efab166b2472d8289d54be1640789c250742
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 10968 bytes
SHA-256: 494563b76398a4074b1dce2e1b714e152c33f03e2c51eecf15a46ef9b3417717
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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