Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c329b89c35ea9e…

MALICIOUS

PDF

109.3 KB Created: 2021-03-13 23:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010ca64f3ea8e6d5f820a0dbdc4ef92a SHA-1: d25fe3927785c698b62077870c1f5d3d51087a1f SHA-256: 78c329b89c35ea9e17bc344bb846a3bb5dc6fe0f246ea9dbecd2442f3d6fb09f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to drive traffic to various websites. The document body, though heavily obfuscated, contains text related to 'direct flights', which is likely a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via the linked URLs.

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://druttle.ru/wix?keyword=direct+flights+from+cedar+rapids+to+las+vegas
    • https://cdn.sqhk.co/rawavuzom/Q9Eibcc/amazon_fire_tv_stick_2nd_generation_stores.pdf
    • http://trelon.fun/57507961998s0lfn.pdf
    • http://fly-drive.online/xapekaripapesiduebxkr.pdf
    • http://goromeo.club/kileziwik1zpv4.pdf
    • https://cdn.sqhk.co/bimerolu/bNhfjdF/71262534939.pdf
    • https://cdn.sqhk.co/xupodafib/gcgijei/base_smart_home_system_design.pdf
    • http://xorabawik.medianewsonline.com/what_is_the_structural_adaptation_of_a_female_lion.pdf
    • https://cdn.sqhk.co/nobutowug/BidvLha/fall_guys_xbox_360_release_date.pdf
    • https://cdn.sqhk.co/xuxofidipo/JhcYJ4z/alquran_terjemahan_bahasa_inggris.pdf
    • https://cdn.sqhk.co/vimexuda/J7ifzgj/civil_war_1863_apk.pdf
    • http://supportcopyright.net/renubojokuzizexetujiz0cyi7.pdf
    • https://cdn.sqhk.co/sirojenu/jdYgcNJ/zijitozefala.pdf
    • https://cdn.sqhk.co/movozuba/f53haef/pew_pew_tactical_course_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6294d3e5-5708-42b0-bbc4-299acc7d05e5/xugimadujujakemugekotuj.pdf
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ddfae9e23a014986bb1acc3219b001f7.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_1c4c7a378c264f2ea621a721d14fb754.pdf?index=true
    • http://jokosen.atwebpages.com/head_first_java_8_free_download.pdf
    • https://uploads.strikinglycdn.com/files/226913b7-fa50-4c7d-a231-749c3a36e142/joketejedetalilukefuwagud.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_4f6fb47868404c5c8d5419ed10af994d.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
    • 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_off000156c9.bin
dc219534cba855f3fe3908faf7595f2cefc050eda3591ed9403f3606886d32a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156C9 5628 bytes
font_01_sfnt_off000169ce.bin
8767d6183b0871e43592aa1f7414985e18630af048f3fdd87f7c200f49f73513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169CE 12028 bytes
font_02_sfnt_off000192ec.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192EC 16036 bytes

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