Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6bd517b8bc2907…

MALICIOUS

PDF

74.1 KB Created: 2021-03-19 08:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98f29d4117e7b80e9792adee3e98ba02 SHA-1: 76db71116481cf20a085a36af26b8e513e060e4b SHA-256: 5d6bd517b8bc2907f86ccc22db0d926a98697aedf1b4b82b67600e7ba872b0dd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to external sites for malicious purposes.

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://midufefew.ru/award?keyword=mathematical+optimization+eth+pdf
    • http://afracheat4.xyz/what_position_helps_menstrual_crampsgghnw.pdf
    • https://cdn.sqhk.co/sewetotab/iiziegs/xazujitutidifogivuwe.pdf
    • http://hydraruzxpnew4af.exchange/how_do_you_set_the_tension_on_a_singer_sewing_machine33737.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/zgjiaUi/19806232737.pdf
    • http://onlyforyou.space/auto_clicker_for_ipad7svmy.pdf
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/08bfb.pdf
    • http://sushibara.net/34734788924thmor.pdf
    • https://cdn.sqhk.co/jokawefezo/gijc3hh/lokicraft_download_for_windows_10.pdf
    • https://gunutusubev.weebly.com/uploads/1/3/1/4/131437775/6990755.pdf
    • http://choosenews.space/como_instalar_appvalley_en_androidcalqy.pdf
    • http://libertinemodels.com/what_is_the_moral_of_beowulfv6jqn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gavobawum/23430333274.pdf
    • https://s3.amazonaws.com/tomaxade/nonprofit_bylaws_template_ohio.pdf
    • https://uploads.strikinglycdn.com/files/ad139204-5661-4249-a578-e0d5ba3abb00/17664834906.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/coordinate_plane_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/c4e08bb2-1e2b-4c57-9912-9cb91a463fff/tavaborexuj.pdf
    • https://uploads.strikinglycdn.com/files/93ab77dd-bcd3-40e9-85a8-061892b7a077/machine_learning_packages_in_c.pdf
    • https://s3.amazonaws.com/ronenitevodo/xujaduramij.pdf
    • https://uploads.strikinglycdn.com/files/03a693b4-03fe-4685-ac11-e97c8a7eb74f/tawevetexosonufawu.pdf
    • https://uploads.strikinglycdn.com/files/82c9062f-cd05-4159-a94e-973a4179070e/map_of_the_world_continents_and_oceans_and_seas.pdf
    • https://s3.amazonaws.com/towakog/nero_burning_rom_2019_free.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_off0000e4ec.bin
02ea2a60abc7c46c469cc9a0263b87994bf3650ad31a750756473eec882d2380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 5176 bytes
font_01_sfnt_off0000f67f.bin
7666a1f3a3c117af6cfb8aa13da54ab437bb98ed4cb36b042b0b1563e65db633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 11004 bytes

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