Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc7e60e200c920b…

MALICIOUS

PDF

112.2 KB Created: 2021-04-23 22:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e4dd31b2f97e02dad867163c544a2d SHA-1: d61b53adeae3cb6c9db7260770025fd0711f4a55 SHA-256: efc7e60e200c920b8616aea9a7441844f0e74edc7cc85e1b90d43d5a391774f3
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, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect the user to a malicious site or download a payload. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=florida+cdl+practice+test+spanish
    • https://cdn.sqhk.co/waxipefimafa/ghijjhF/alexa_rank_checker.pdf
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5ff5903cbcc86.pdf
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/mitifilekazof.pdf
    • https://cdn.sqhk.co/mobobelelu/hbWomib/tiny_planets_episodes_wiki.pdf
    • https://cdn.sqhk.co/zodunoxurob/Yichchg/best_recharge_plan_for_vodafone.pdf
    • https://cdn.sqhk.co/vetipewalu/0jakwhh/rusijug.pdf
    • https://cdn.sqhk.co/jegamaxegev/cfgiiWG/49784693690.pdf
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/3752094.pdf
    • https://novomegaweg.weebly.com/uploads/1/3/4/7/134738931/peketetad-nowaren-lolufi-simokuzoxe.pdf
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/sezagezoj.pdf
    • https://cdn-cms.f-static.net/uploads/4491398/normal_5fdbc614aac0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3101bfa2ddd74563acc47b82cbc37971.pdf?index=true
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_1f32caecec91413c95cdcc43c24ef57b.pdf?index=true
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_19ded4d5757640ba81a5f46cf739475e.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_6be04c3be67c4eeabca46639ed31138c.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_fce8ad4dbf7c41dabcb93dc948ce7ae5.pdf?index=true
    • https://ad16408e-fbd2-4c0d-b170-1fa3f72263cb.filesusr.com/ugd/bcd086_e7f9becf224c435bbf5807d2c82aa233.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_dd77e3dadac343d8abfebc2f0a672f9f.pdf?index=true
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_8b6e6b6ff71b4238be9387be3ec8bc05.pdf?index=true
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_17c41e0b17854e3597ebfe9fd44de5c6.pdf?index=true
    • https://73e8eba8-f08a-4c12-987a-519a82e171c2.filesusr.com/ugd/19159f_4ff9cbdfd53d4a85883e482e51f9e1df.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fe7.bin
430565fc5c1b010001524c3aab9d63abd3172ef23401713913fdc59c7af26ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE7 4904 bytes
font_01_sfnt_off00017076.bin
1182553af4e4e1d4f08dc5c53a41ba3cf7bb24133579164eb638a84c8e765df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17076 2012 bytes
font_02_sfnt_off000179a9.bin
b376bc5fd7c3cc2a064740081438289ad3456dee25bf49dbf2223f0f7aa88468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179A9 13104 bytes
font_03_sfnt_off0001a4cf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4CF 4324 bytes

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