Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4d6e490f4dda3f…

MALICIOUS

PDF

84.2 KB Created: 2021-03-15 21:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb098fb656cabae0031327264a13ff3a SHA-1: bf59d5f41410c868d3a468199ed202c35ce6c505 SHA-256: 8c4d6e490f4dda3f08cb0ac11023317879f289ff1fc94196fda46de308218053
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a mass of external links, including one to 'vilenefex.ru', suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=death+penalty+essay+titles
    • https://cdn-cms.f-static.net/uploads/4480899/normal_5fe68d2b53d79.pdf
    • https://cdn-cms.f-static.net/uploads/4464724/normal_600dcaa41efd0.pdf
    • https://cdn-cms.f-static.net/uploads/4462697/normal_604cca91c173b.pdf
    • https://cdn.sqhk.co/noxisoture/hfhiYij/jogos_pc_utorrent.pdf
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fc96cee52942.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/6540460.pdf
    • https://cdn.sqhk.co/tinajugezepi/djjfbhj/bright_butterfly_doormat.pdf
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/391714a9c.pdf
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5fe28c4a80244.pdf
    • https://cdn.sqhk.co/wudawagirus/gegdoid/stick_war_3_unblocked_hacked.pdf
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fcc5e7e95544.pdf
    • https://cdn.sqhk.co/sovokeduseb/KQhdWNu/boy_games_unblocked.pdf
    • https://cdn.sqhk.co/togodawexu/iakjhjd/bus_simulator_original_mod_apk_3._7.pdf
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5feb4144b2dde.pdf
    • https://cdn.sqhk.co/nidaruzada/BQWQPjc/15590457767.pdf
    • https://cdn.sqhk.co/ranotigu/giigdTx/andor_s_trail_walkthrough_hearthstone.pdf
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/9760417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7df36e43-1a86-4ba6-96c3-1cf03c5da6bb/fitbit_flex_2_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/bd1f1f81-14a3-419d-b260-7821e1be4a53/john_c_maxwell_leadership_qualities.pdf
    • https://uploads.strikinglycdn.com/files/d4ce1448-79fa-4317-bc16-679e42c151ba/zurirupugofezewazefisofu.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin
f37130c5c48af5c7017c0572f88e9920d5bf41afeea09dfbe7b03caa6327e8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 4912 bytes
font_01_sfnt_off000107e6.bin
73fd97620228d37ece768af04de8beffc6ac832f19150b0920840886d03bd945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 11064 bytes
font_02_sfnt_off00012df4.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 16204 bytes

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