Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb39a54fa475adc…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 09:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 769114a64d83bdaf0aa72f87e19d079a SHA-1: 78b181415cf70acb9c9b54524253fdf789a4fa2a SHA-256: 3cb39a54fa475adc4d1697a4fd2e3808c671eda848bd6a5186e63965d28c180b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/wix?keyword=run+3+mills+eagles
    • https://cdn.sqhk.co/ralapogifur/Ohdggjj/should_i_homeschool_my_child_with_adhd.pdf
    • https://cdn.sqhk.co/mekibekowufe/gicjbie/69442712261.pdf
    • https://cdn.sqhk.co/zorimedi/Z9iawFC/13979022852.pdf
    • http://tapagigozi.medianewsonline.com/april_2020_current_affairs_free_download.pdf
    • https://cdn.sqhk.co/rureroso/ja5icGD/25086358244.pdf
    • https://cdn.sqhk.co/semexixok/fTjtAia/feretiweludi.pdf
    • https://cdn.sqhk.co/baruduwege/ihic5ib/14242050669.pdf
    • https://cdn.sqhk.co/lepudijazur/ir0hflU/redskins_qb_allen.pdf
    • http://memisada.mygamesonline.org/12502818248.pdf
    • http://mukinumatonewo.getenjoyment.net/nodujanudafuzuve.pdf
    • http://zutatowatipo.mywebcommunity.org/47162563194.pdf
    • https://cdn.sqhk.co/wupetutigo/jhjfhgr/mystic_messenger_jumin_bad_ending.pdf
    • http://lexaxak.mywebcommunity.org/mujoveketiwatukebizegep.pdf
    • https://cdn.sqhk.co/bovutolomevo/gcghgj4/rajifokoxesipapifefukugib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_23099999140f45a2b6174d1b9a027bd9.pdf?index=true
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_864d19ff35734c71906f5b14dc863874.pdf?index=true
    • https://s3.amazonaws.com/voropa/contractions_spelling_worksheet.pdf
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_5f6b43f250884ed882dd7c1533b5445a.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_17efe60461d346a19412a238126282bd.pdf?index=true
    • https://s3.amazonaws.com/fajonubinomeder/noxanodurubemijakas.pdf
    • https://s3.amazonaws.com/diwitapezu/14053993803.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_fd15bae9fc2f409285ab32a836b38491.pdf?index=true
    • http://winimoviwimi.myartsonline.com/rhetoric_aristotle.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_off0000f7c0.bin
92cb2b96dba2bc2221f361a59c2c2a29e7a066715d149395382d4d39fc481255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 5080 bytes
font_01_sfnt_off00010902.bin
088320091369333b3e1f61b40d152d71c1b3200ef8cac7f9137245a154f83615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 12488 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.