Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3346411cbdfab37…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 07:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da160a1f93d09912b3cc7d5ab2f3de59 SHA-1: 46a4764097a6f7a3abe18142263dd8cb52c3e34a SHA-256: a3346411cbdfab37de1dd4aa1dfde20764bd890aced2de1861d1eb2131e5d6ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious activity observed is the embedding of numerous URLs, likely intended to redirect users to malicious sites for phishing or other nefarious purposes. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=transform+geographic+coordinates+to+utm
    • https://cdn.sqhk.co/sejejajoxej/iBSbqcJ/siwurofezapamudidaraloge.pdf
    • https://cdn.sqhk.co/jixuvepabu/h2gib1C/rummikub_instructions_in_spanish.pdf
    • https://bomevalaruzaf.weebly.com/uploads/1/3/4/8/134871705/19daf87cca.pdf
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/7cc0e.pdf
    • https://cdn.sqhk.co/mamabukalom/jishhih/difference_between_polar_form_and_cartesian_form.pdf
    • https://cdn.sqhk.co/xuwolupenilu/aJjezPn/iphone_4_cydia_apps_free.pdf
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/430d44e31.pdf
    • https://cdn.sqhk.co/xusikeko/roQ3jh2/remudesonibozujazetujanu.pdf
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/8247224.pdf
    • http://pabubojuboju.iblogger.org/43998392369.pdf
    • http://maretexojud.66ghz.com/50707574205.pdf
    • https://cdn.sqhk.co/sadetujadufi/gfibghP/my_talking_cat_2_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a53fcf70-04dc-468c-b16b-91f20e80c8bc/88937646561.pdf
    • https://uploads.strikinglycdn.com/files/ac7bc357-c11a-40c4-bc3a-84561d0f2d0c/52524939547.pdf
    • https://uploads.strikinglycdn.com/files/74517f3e-e548-485f-ac51-fd7356b67a4b/2394902734.pdf
    • https://uploads.strikinglycdn.com/files/783414ef-3706-4a57-b620-14ad32d5c4f2/how_to_scan_double_sided_on_fujitsu_fi-7160.pdf
    • http://xubulaxojetuka.rf.gd/malistaire_dungeon_guide.pdf
    • https://uploads.strikinglycdn.com/files/799f3c1e-a893-4ba0-ac16-9c70ab312221/reset_frigidaire_affinity_top_load_washing_machine.pdf
    • https://uploads.strikinglycdn.com/files/2f0b8785-10de-4c82-b419-d1afd7435eea/gumetumew.pdf
    • https://uploads.strikinglycdn.com/files/dce2a14b-467d-4158-9944-00fdcda9cc8c/c_programming_for_beginners_books.pdf
    • http://jazipas.epizy.com/batoma.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_off0000f351.bin
e9b8c8220523c5b02fc459006cbe4a3b7b509ad5a8b70fd0147cec3654e51de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 5488 bytes
font_01_sfnt_off000105cf.bin
e5d2aac84df5e6187782409c469a48d19dfe362c443a8a01d625cb3791114b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 12652 bytes

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