Malicious PDF — malware analysis report

Static analysis result for SHA-256 43706962b8f7bfb4…

MALICIOUS

PDF

66.1 KB Created: 2021-03-15 23:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec58f5bb9d1e3c2a1ae08762a817a2d0 SHA-1: 2830b4d9e6765852e540fd4e6eabbc5e34436d7f SHA-256: 43706962b8f7bfb4b244a67e423e2c83b03c44f492216d68e3249c311d6e6366
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to `maypoin.ru`, suggesting a link farm or phishing attempt. ClamAV detection as `Pdf.Phishing.Trojan` and ML classification further support malicious intent. The document body, though truncated, contains metadata suggesting it was generated by `wkhtmltopdf`, and the presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content.

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://maypoin.ru/wix?keyword=purple+wolf+ears+and+tail
    • http://gawudubigojan.getenjoyment.net/assistant_educational_psychologist_jobs_london.pdf
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/guzovilali.pdf
    • http://jedilinosur.mywebcommunity.org/63863325738.pdf
    • http://jushq.club/google_translate_apk_for_jio_phonepmuag.pdf
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/xoxenevigukewil.pdf
    • http://finansi-7.online/how_to_clean_a_cva_optima_breech_plugsg8g7.pdf
    • http://mp4.design/niv_archaeological_study_bible6ouk7.pdf
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/36400.pdf
    • http://tiktoktop.design/how_to_start_an_electronics_companyd71oe.pdf
    • http://xonibiz.22web.org/delhi_sultanate_history_questions_and_answers.pdf
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/kebimexegavu.pdf
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/nubovunakizawat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_e3885ef5bb2142dca9064447653d48b7.pdf?index=true
    • http://wiloradakuno.onlinewebshop.net/10952072840.pdf
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_9c7cd430b53046c29eb20b715e33f813.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_6981013ba81543f4a29b3db682f9bacf.pdf?index=true
    • http://wuluveviwibe.epizy.com/which_book_is_better_tom_sawyer_or_huckleberry_finn.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_67aeb5b18ee44a0bb480b3419676e0b6.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_off0000c67b.bin
5de200ed7563e57eab75534eb315ff9dbd928a00715f071f44f56ed2f50ab6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 5128 bytes
font_01_sfnt_off0000d80f.bin
bbd80dfa31a4057a4293f66fc02dcd6e2d9b79ac3ec74e3e4db3805b6e5d6e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 10652 bytes

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