Malicious PDF — malware analysis report

Static analysis result for SHA-256 9540f93e9952c82f…

MALICIOUS

PDF

80.6 KB Created: 2021-06-06 06:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5833f6205bec46df24c5d11d1f217585 SHA-1: cf95b1e328f905c455bb9f51fa96dfa0a38075cd SHA-256: 9540f93e9952c82f66423d15df57e3ad2f33f523fcc159ffa3fdfe4df97bc670
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One of the extracted URLs, https://golowaki.ru/123?utm_term=krishna+ji+bhajan+video, is a primary indicator of this malicious activity.

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://golowaki.ru/123?utm_term=krishna+ji+bhajan+video PDF link annotation
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/wililulijena.pdfIn PDF document text
    • https://ramexolilaburav.weebly.com/uploads/1/3/4/3/134331107/5488400.pdfIn PDF document text
    • https://nabatiniwoz.weebly.com/uploads/1/3/4/8/134889778/faxebegi.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/vajot_kazadafebexap.pdfIn PDF document text
    • https://xizerusepu.weebly.com/uploads/1/3/4/3/134308384/203f1c977ed420b.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/legikuvu_gejudanute_levokudajomed_sagiroxajuko.pdfIn PDF document text
    • https://nurituxokel.weebly.com/uploads/1/3/4/8/134849265/6176430.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/9815750.pdfIn PDF document text
    • https://lonodoxelu.weebly.com/uploads/1/3/4/3/134305804/sopere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://tovovojufa.pbworks.com/f/my_etisalat_app_esim.pdfIn PDF document text
    • http://seromazu.pbworks.com/f/how_do_you_reset_a_rca_voyager_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128ee723-b45f-42b1-b97f-9846e1955b6f/is_there_an_age_limit_to_be_a_navy_seal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042cfb7a-d68a-4bc2-ada2-3b684bd90aca/tigulu.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/05_polaris_ranger_500_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f0a695-8563-42f1-a0a9-bc9b9a356bf5/14750116099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a03869-daf5-4e49-a63b-d64bf0e12d4a/why_does_my_motion_detector_light_stay_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41e8f1d-45d2-48d3-9519-812f3d637388/how_to_become_a_3_man_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de065778-c1b2-4891-ac22-5f69e6c0f6fa/how_much_oil_does_a_04_toyota_sienna_take.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144446739/kubobadumafodijanenaj.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/f/hossana_marcos_barrientos_acordes_piano.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/dejevaruse.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/w/file/fetch/144672318/english_words_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f35d377-2711-45d9-a18c-244541144789/2076846653.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 5128 bytes
SHA-256: 235b1b0116ab6f4965024fdd5d44125658e74ca0a1802cb6810d93e8178e02bb
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 10812 bytes
SHA-256: f77a4e972de6d53133db8c042775245bccb04459f71bbe240c2c82e5c8695a49
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 3468 bytes
SHA-256: 8284976e3a21b01614348d23ab8a5144c61434ad65e61125d1dcbac0c89d2940