Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c18ea10c9d9cfe3…

MALICIOUS

PDF

69.5 KB Created: 2021-03-22 04:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b1cc62d6d98209ecbd07f63db60fb11 SHA-1: cc61491b8db3f62bad2c119372cec93aac24d922 SHA-256: 1c18ea10c9d9cfe35e0695ebd926319985c1fba2895a1153210e15dfcb0ec8ed
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9720

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/award?keyword=cd4052bd+datasheet+pdf
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5fdd3804626ea.pdf
    • http://dimax-matrasy.ru/99788040972gb8ai.pdf
    • https://cdn.sqhk.co/remezebona/hgmW1hf/f1_manager_2019_cheats.pdf
    • http://sq11mini.com/the_transactions_of_spade_company_appear_below_quizlet6auq6.pdf
    • https://cdn.sqhk.co/zujumatatub/ajijiUj/takeout_arkadelphia_restaurants.pdf
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff249b2b9dd9.pdf
    • https://cdn-cms.f-static.net/uploads/4478933/normal_602fef1112597.pdf
    • http://frukt.fun/94738483663nqwj3.pdf
    • http://graatorama.space/jowimokugogosafosero3hitb.pdf
    • https://static.s123-cdn-static.com/uploads/4446921/normal_6000f0f1a12b8.pdf
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5fe021a67cc6c.pdf
    • http://filozajerezabi.getenjoyment.net/raxusemoboti.pdf
    • http://rulajamizap.getenjoyment.net/programming_in_c_by_ajay_mittal_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_4c61c1f7ca4d4355b37934aeb72562fa.pdf?index=true
    • http://nibizuladode.onlinewebshop.net/attack_on_titan_movie_part_2_cast.pdf
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_e3d389ae991749dbbae89df0b2641085.pdf?index=true
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_b75ac8e50fa541578745579f665ae54f.pdf?index=true
    • http://nuvebabe.atwebpages.com/bill_of_rights_south_africa.pdf
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_e2135338ffb84681a2e041b4493d8c60.pdf?index=true
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_25a0c17873c148d2b341a33d9fa7da7f.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a8.bin
4f21566362a00b801ccf6c2cc412856aa7c4a3d68209bdf0d706e31e5e87bf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 4324 bytes
font_01_sfnt_off0000dff6.bin
4710779a735b837f370eb514720a5c927be77668518c1e513512d4efccecb77c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 5532 bytes
font_02_sfnt_off0000f2cb.bin
4c378f08152d0a27163f6f7c0c8ba23919484c9313a75ef4172f3c8e1a3039e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 11216 bytes

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