Malicious PDF — malware analysis report

Static analysis result for SHA-256 23df6d54fe837a4f…

MALICIOUS

PDF

90.6 KB Created: 2021-03-15 19:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc04e9ca3211d5ad12191074f913382 SHA-1: 35378b0ab53c3409ab0289460d2488d1275e4289 SHA-256: 23df6d54fe837a4fcccf5ac32db3ce05ff90584e5a4bb8240a4d5f05c012871f
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and dates, suggesting it was generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/award?keyword=dreamweaver+cc+2020+tutorial+pdf
    • http://digtalcaliper09.xyz/how_to_get_mewtwo_in_pokemon_crystal_clearggv6c.pdf
    • http://tixshopclub.fun/tulenixinibosozuyimg0.pdf
    • https://cdn.sqhk.co/lazuxorus/5jjEijI/piano_tiles_pop_songs_online.pdf
    • http://gexomafe.mypressonline.com/4457863881.pdf
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/99bce36e8.pdf
    • https://cdn.sqhk.co/dubeminap/ifffARh/setawexopomosamajazale.pdf
    • http://gazagidumow.mygamesonline.org/most_difficult_questions_to_answer_about_life.pdf
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/9870856.pdf
    • http://tiwilofojifig.sportsontheweb.net/cruus_e93839_motherboard_drivers.pdf
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/sitipesinexatuwuf.pdf
    • http://forsage.pw/bootstrap_template_website_freexh0ic.pdf
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/banemukomufin.pdf
    • https://cdn.sqhk.co/vilonunufuk/cNjeRhi/lukigojaditobirukinofo.pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/jusofe.pdf
    • http://wixujikubipom.mygamesonline.org/example_of_abstract_in_thesis_paper.pdf
    • http://dizurexemubegog.mygamesonline.org/41083015778.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kewevagisugimuw.onlinewebshop.net/vupomovexubofafir.pdf
    • http://jezevenakos.myartsonline.com/5559460030.pdf
    • http://gutekuretejapoj.onlinewebshop.net/what_are_the_best_cordless_phones_to_buy.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_off0001241c.bin
9da2a5873e5e84e86608500eef2c86fcf08564d79e9511e9a25ccff9e700bb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 5548 bytes
font_01_sfnt_off00013702.bin
804451b94c9c4fd435bef18dc4237061ce90161af26580e443ca371f760c3d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 11300 bytes

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