Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce2366b543cdd8e…

MALICIOUS

PDF

78.4 KB Created: 2021-05-11 13:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218e5fc4035fa25007c36c97963fd7f5 SHA-1: afb9c5dd588d14638ad7c58c81cb6ae653ea1155 SHA-256: 7ce2366b543cdd8e1aa789127c0cd50e9d2a3fb33131da293aa090db0766d801
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the presence of numerous external URLs indicates the primary goal is to redirect the user to potentially malicious content.

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://botokaw.ru/strik?utm_term=girl+scouts+song+lyrics
    • https://static.s123-cdn-static.com/uploads/4456686/normal_60069adcd8a66.pdf
    • https://cdn-cms.f-static.net/uploads/4465003/normal_60390b7ba936b.pdf
    • https://static.s123-cdn-static.com/uploads/4453550/normal_600659cacb49d.pdf
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5ff111882d715.pdf
    • https://cdn.sqhk.co/metexemoraga/SQvZjci/fidudodugivaxo.pdf
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5fcabee77d6fa.pdf
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5fe279d99980f.pdf
    • https://cdn.sqhk.co/lekusovu/ijPXiQm/cara_cheat_dragon_village_android.pdf
    • https://cdn.sqhk.co/xagogudexo/ihaJBVT/kabir_singh_rock_music_ringtone_download.pdf
    • https://cdn.sqhk.co/rajexizeba/2992Bhh/62023852391.pdf
    • https://cdn.sqhk.co/piwoputi/ydvDgiN/watch_live_nfl_games_online_for_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_0541906df2c54bb9bdec98fae3ac8db4.pdf?index=true
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_cb1640c5a2124df9b8b6ca33b922fae6.pdf?index=true
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_8cbd82b5109a4b24b96212b5027d5283.pdf?index=true
    • https://s3.amazonaws.com/gezetega/machinery_of_government.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_edc34000f31d4d9387cce0116d40f77f.pdf?index=true
    • https://s3.amazonaws.com/donake/wokonasinurogolojowolofo.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_a6ceaad495f340acbb123d98c8613fdb.pdf?index=true
    • https://s3.amazonaws.com/viromibukoleliw/41084628237.pdf
    • https://uploads.strikinglycdn.com/files/0b011c7a-babe-44ae-bc37-6a6682d31068/download_perfume_the_story_of_a_murderer_2006_sub_indo.pdf
    • https://uploads.strikinglycdn.com/files/67fde044-61b7-4cee-9493-d4013e5e6614/58551726710.pdf
    • https://s3.amazonaws.com/sajatofubote/kaxof.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_off0000f57b.bin
b0dfdea80ed5621bc112bacff230da925da626562c9f0674fd1bbba0a24ae561		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 4892 bytes
font_01_sfnt_off00010644.bin
53da5fa98d1af4bc00d8c52d5d6635e6143002fd3c7ccd4ea0277e8e327bcda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 11000 bytes

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