Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc1e0fe185eeec1…

MALICIOUS

PDF

73.4 KB Created: 2021-04-07 02:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be79b9d4ecbb023152dc13ae8cc34e0 SHA-1: 469ccb7353a4eb91cee7c5b48fb68ca2765e8439 SHA-256: 3bc1e0fe185eeec12a18040f09ae1ae62482ef74c4ea81f1bb631654fd162d1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate resources, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

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://fokemale.ru/wix?keyword=9.3+fermentation+answers
    • https://cdn.sqhk.co/kuxixixixi/gfSyU6A/56025151517.pdf
    • https://nivuzodix.weebly.com/uploads/1/3/1/4/131410872/tidigesinaduvazet.pdf
    • https://cdn.sqhk.co/mugodetutag/hfoafgi/sonic_dash_2_mod_apk_revdl.pdf
    • https://cdn-cms.f-static.net/uploads/4498994/normal_60342f6094e90.pdf
    • https://cdn.sqhk.co/xugumewaz/ichWojf/41601980528.pdf
    • https://cdn.sqhk.co/pewonogip/Rgepmif/waxinidivomofebavewonim.pdf
    • http://pokuwasu.iblogger.org/mekojosevodaxevi.pdf
    • https://static.s123-cdn-static.com/uploads/4389370/normal_600923eb3e6b6.pdf
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601db2fec11a1.pdf
    • https://cdn-cms.f-static.net/uploads/4367627/normal_60188c47a62f5.pdf
    • https://cdn.sqhk.co/naxupowu/jrnUigZ/ny_and_co_outlet_stores.pdf
    • https://cdn.sqhk.co/ravuviwidi/djh6hzM/34294995041.pdf
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/gamexelizu_kalebidumisu.pdf
    • https://cdn.sqhk.co/fosuzonarefi/fjhLidu/autocad_dwg_to_converter_online_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kagubosewox.epizy.com/4th_grade_math_addition_worksheets_printable.pdf
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_01cd294b00cc4daa9d4ee0355b259ab5.pdf?index=true
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_45c1610b53dd44c290641168c9a44d74.pdf?index=true
    • http://taperimogitunal.epizy.com/is_brawlhalla_cross_platform_on_xbox.pdf
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_06a37b11344545519feb087e3e13f2f2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d335.bin
7aa8732b2ffd2c04edda5b98da966b7ce9221990eb4768dcf27fa252672c01d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 5020 bytes
font_01_sfnt_off0000e42a.bin
78a54bf43f084e3358b31394117a5fb8f98e921efb04701fbb799cb1037ba0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10808 bytes
font_02_sfnt_off00010933.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 4324 bytes

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