Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5ac96913f81582…

MALICIOUS

PDF

86.5 KB Created: 2021-03-19 03:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1269c900f48a2543625c9ca46448ca9d SHA-1: b904713deafa42a61c1d133975e39f75cea32a7d SHA-256: 8c5ac96913f815825226892a67bb6ecb00b4cb1dbac5fe53fc32d602a99bea39
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing and a trojan. While no scripts were extracted, the sheer volume of external links suggests an attempt to drive traffic to potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=how+to+prime+graco+airless+paint+sprayer
    • http://autobaff.xyz/40861644950kwlar.pdf
    • http://riwopebikiguwa.mywebcommunity.org/because_you_loved_me_piano.pdf
    • http://ilmahli.com/9499333598ajgf4.pdf
    • http://55571.ru/41013369719lbh0a.pdf
    • https://cdn.sqhk.co/fosuzonarefi/giWhfib/97824701492.pdf
    • https://cdn.sqhk.co/vuwewiwudesi/cfjfgcc/26066769.pdf
    • http://zugapuvu.mywebcommunity.org/lg_washing_machine_repair_hotline.pdf
    • https://cdn.sqhk.co/zarepowake/gfiiggN/hd_wallpapers_for_macbook_pro_retina.pdf
    • https://cdn.sqhk.co/jimavidozeze/6ghdmij/cafetaria_marco_menu.pdf
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fe16290093d4.pdf
    • https://cdn.sqhk.co/givikofuf/jjaIhhK/radiant_defense_perfecting_liquid_reviews.pdf
    • http://pannochki-art.com/cisco_router_e4200_firmware_download6wr39.pdf
    • https://cdn-cms.f-static.net/uploads/4418788/normal_601aab6ab751d.pdf
    • http://ruluzuzadol.mypressonline.com/isentropic_efficiency_reciprocating_compressor.pdf
    • http://vashobereg.com/walt_whitman_as_a_poettrqkc.pdf
    • https://cdn.sqhk.co/sivefuxonix/jc9heI3/42085450262.pdf
    • https://static.s123-cdn-static.com/uploads/4420028/normal_5fed4a1307106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kaxuwenewutexu.myartsonline.com/how_to_make_a_face_mask_pattern.pdf
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_ae0028336a8342cbbf7174e2b48e584a.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_18bc251d1d4b462385099df7641e72de.pdf?index=true
    • http://totuxivez.onlinewebshop.net/bio_data_format_file.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a3.bin
d798bcf1b7b1b3b813522a114469a9f60d411bc7e9b1665c36d0e335327106ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 5196 bytes
font_01_sfnt_off00011643.bin
5a63ed64cf6bb62743f053438ee5758cb26c1a81e4870c86aefe4c9cb3ade4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 11676 bytes
font_02_sfnt_off00013e2b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 4324 bytes

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