Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd431f8c593c7ba…

MALICIOUS

PDF

108.7 KB Created: 2021-04-05 03:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7386553a14dbf4276bcb6627fd979f29 SHA-1: 67d1955370fad3887fe7da7b71ab80ec05899ff6 SHA-256: 0cd431f8c593c7bacf3502e46e8ba759920ece9a48d2635bd4837d15d3009caa
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with heuristics indicating it's a link farm and a redirector to malicious infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=is+ruger+an+american+company
    • http://899themes-demo.ru/kitchenaid_mixer_ice_cream_maker_manualyseux.pdf
    • http://kvrovk.xyz/riddles_and_brain_teasers_rebus_answersz5juq.pdf
    • https://cdn.sqhk.co/kezomerameki/hhxPham/bomudil.pdf
    • https://cdn.sqhk.co/ziveluki/jailjjg/mufusolinosabujopev.pdf
    • https://cdn.sqhk.co/xovujiroveg/ggegd3f/draw_your_game_mod_apk_pro.pdf
    • http://bigops.fun/xupavixepedebidiw2fdmi.pdf
    • https://cdn.sqhk.co/mijajijem/dOjchh2/42704253804.pdf
    • http://jitutirujemi.22web.org/tommee_tippee_perfect_prep_machine_user_manual.pdf
    • https://cdn.sqhk.co/jawafurovif/hhAicqh/63991147559.pdf
    • https://cdn.sqhk.co/fabunavaxa/UZihhiJ/pizza_chef_menu.pdf
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5ff3ebba6608e.pdf
    • https://cdn.sqhk.co/kerutadit/ibiejeH/80545681083.pdf
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcf1fcd54578.pdf
    • https://cdn.sqhk.co/sovajepuxe/ijgglib/barrett_jackson_2020_broadcast_team.pdf
    • http://reactivaperu-2020.com/medication_dictionary_uk47k3t.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_603f6793987c3.pdf
    • https://cdn.sqhk.co/liregevo/wuLjaVH/lost_bubble_bubble_shooter_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5fe077107fe5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_f6c09d3f49e948de9bd3657002394e6b.pdf?index=true
    • http://vefilemegukur.epizy.com/rosoni.pdf
    • http://dodudulu.epizy.com/rupenerepefidevoz.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_a69bd399a3d5426e95b2b8ce8c05cf96.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_13d0278f86e54965a081cb9428f2b0ae.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_off00016a87.bin
575035ff2cb048287541097ff02e8347552817093de31801840842da40e64f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A87 5260 bytes
font_01_sfnt_off00017c62.bin
1d24f3fee11b3aebe53a11ecc55c62abf174d4be5bdd53b56261231ca9038b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C62 11928 bytes

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