Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c2b1fe4a8778a4…

MALICIOUS

PDF

89.5 KB Created: 2021-03-30 20:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b07af8dd98b704b5dad285412ceba17 SHA-1: 1407f7dfa843f0e625eac8fa9421cecbf7cbc685 SHA-256: 25c2b1fe4a8778a46d108e9bc6c0f7600cbcce199b23e3a362a289b63f36b965
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attempt, likely initiated via spearphishing.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=craftsman+precision+plus+lawn+mower+190cc+parts
    • https://cdn.sqhk.co/womalakifaxa/g9shHia/xapoxuveronuwuvuz.pdf
    • https://cdn.sqhk.co/buvaboda/gj9wG9E/holy_city_of_islam.pdf
    • http://bekopomulasebi.getenjoyment.net/what_is_after_new_moon_twilight.pdf
    • https://cdn.sqhk.co/xedaberetaj/gjgigAY/among_us_free_play_unblocked.pdf
    • http://duzegotola.medianewsonline.com/7421364237.pdf
    • https://cdn.sqhk.co/sabiwizi/gheHid6/soviwejofuvezetes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nosigegu.onlinewebshop.net/how_to_write_a_review_paper_example.pdf
    • https://s3.amazonaws.com/bofake/mesudezewiwe.pdf
    • https://s3.amazonaws.com/kukupunopedon/lollipop_navigation_bar_app.pdf
    • https://s3.amazonaws.com/tajimipojimo/aflatoon_movie_mp4.pdf
    • https://s3.amazonaws.com/piwupevivotixi/pmdg_airac_free.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_2ffbe30a299e420fb3d2f6f6a5c30f14.pdf?index=true
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_70cc75e857284720a8a03fb1ae460e87.pdf?index=true
    • https://s3.amazonaws.com/siwixomudit/55138724581.pdf
    • https://s3.amazonaws.com/besafefaf/final_fantasy_13_game_guide.pdf
    • https://s3.amazonaws.com/muvarelo/mawabenanugo.pdf
    • https://s3.amazonaws.com/fulazelof/6595574093.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_9f34c74b308440f3a9565252741b203f.pdf?index=true
    • https://s3.amazonaws.com/mufukep/wisivulebalelibizuzigin.pdf
    • https://s3.amazonaws.com/varoximu/android_sdk_versions_market_share.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f01.bin
244824cc1646a3957885154843a3682a0e019477a2ad432c6c2dce0841713552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 5508 bytes
font_01_sfnt_off000131bc.bin
631151a6d3e3154cb478754b9ba40149fe3af6987174b3e74427ee7a8ee58587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 11336 bytes

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