Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca4794d309dc03e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 07:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb9d61c44cd1cc2c1066609f61388b9 SHA-1: 491b5ee9795812f4458be34c24ca9575d6d06c27 SHA-256: 6ca4794d309dc03e8c94dfd6ce12978d875ed8499327db1e14e4ac872e5fb636
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent URL, 'https://nipisod.ru/wix?keyword=five+nights+at+freddy%2527s+2+hack+mod+apk', suggests a lure related to game hacks. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=five+nights+at+freddy%2527s+2+hack+mod+apk
    • https://cdn-cms.f-static.net/uploads/4412568/normal_601583c4986d3.pdf
    • https://fofaxofik.weebly.com/uploads/1/3/4/5/134521529/8725966.pdf
    • https://cdn.sqhk.co/risejesob/ghidWjg/game_zombie_frontier_2_mod_apk.pdf
    • https://cdn.sqhk.co/tatiwurixiwo/vjjzhdU/zamenatop.pdf
    • https://cdn-cms.f-static.net/uploads/4483365/normal_602530cbcfe98.pdf
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcf47c5d053e.pdf
    • https://bapiribudiwapik.weebly.com/uploads/1/3/4/8/134885568/dipitewaze.pdf
    • https://cdn.sqhk.co/lekusovu/jdiajfm/11649644379.pdf
    • https://cdn.sqhk.co/susojareb/aiihRjd/teachers_pay_teachers_gift_voucher.pdf
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe226e5c573b.pdf
    • https://cdn.sqhk.co/xosuridasago/hgCjcjg/be_my_match_otome_romance_games.pdf
    • https://cdn.sqhk.co/kitujesijak/MuqVgdi/geziluz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/1737073413.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c492cd1e9dab43c58e0a03bce70ddd0f.pdf?index=true
    • https://s3.amazonaws.com/buganabowumujef/adtran_netvanta_3200_manual.pdf
    • https://s3.amazonaws.com/semuxemakaw/59789315455.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_2948b75bbb3d4e62911c5685f1aa9038.pdf?index=true
    • https://s3.amazonaws.com/goneduzum/advanced_life_support_guidelines.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_566ce61884404acd914a62328c56f5c4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e776.bin
78cf349e9a530dabe27f21a4eb4847aa0395d7004c5c1eae58c3087d69faa1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 5884 bytes
font_01_sfnt_off0000fb7a.bin
5058428b41323244e07ef11aec7c303cd4467930b371a0b8757c4137e718071c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 11740 bytes

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