Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf5c678ba0ca415…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 04:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 98e891b696bedf76445f025f7488c1e5 SHA-1: e9b6a663e43f8a7f59293c6f419eaa9c25038f48 SHA-256: baf5c678ba0ca41513cac4b1f20a94ee8457659ddd598532977498fc3c7d2771
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=you+never+eat+alone+the+series+ep+1+sub+indo PDF link annotation
    • http://xamawodub.22web.org/pathfinder_book_apex.pdfIn PDF document text
    • http://rexexepunefa.22web.org/kokolox.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/ad651f1.pdfIn PDF document text
    • http://wipogavor.iblogger.org/back_to_back_drawing_activity_templates.pdfIn PDF document text
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/wonifelegenot.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/basogibadimeb_pobifezet_zatakuvote.pdfIn PDF document text
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/tojema.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/sotuwazuw-bisijof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonisan.epizy.com/jepobivadute.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/how_to_transfer_units_in_the_army_reserve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bda0549-01c8-4a6d-813b-774df2ba0e5e/fotidilugox.pdfIn PDF document text
    • http://nexuvojof.epizy.com/rikilelevibuda.pdfIn PDF document text
    • http://fosufozixa.rf.gd/osmania_university_degree_hall_ticket_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7476ed3e-c6fd-4fd1-93f8-6fe81a4e28e0/don_juan_demarco_selena_song.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_7e75d26c28fa43b1bb8f2f8f4d68b716.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_7802bcba29cb4a7ab54c7b6b1500f1cf.pdf?index=trueIn PDF document text
    • http://keximatefabuzi.rf.gd/53751949048.pdfIn PDF document text
    • http://rokutore.rf.gd/62513979457.pdfIn PDF document text
    • http://tikuvusupatel.rf.gd/communicable_diseases_questions_and_answers.pdfIn PDF document text
    • http://memaded.epizy.com/nokujuwolutudemonata.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_fcccf04d885b4a16a2c127bed39e1f9b.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_58fb56b5421046fd980f13b0487ae23b.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_8bc9b66561134db7a5c3e2d57e60cdf3.pdf?index=trueIn PDF document text
    • http://femavumifixomud.rf.gd/navy_diver_jobs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 5260 bytes
SHA-256: 2a20807732e98c37c0f126c6b4ba2c702ced477c8f2d01728a35e0c9bbb2ba2d
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 12104 bytes
SHA-256: 0c4096e0c10a9bf8330840d5932e3775e7832f53ec642711607ea778e7dff1fe