Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f60192c846fc3d…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 10:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3c30f8de698b38fb4ad1786615016707 SHA-1: 4073e5149ad7620970518aaa386c48964664a1cb SHA-256: 83f60192c846fc3da2f57643690160b2714374142f53b35276780447e34fe63e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external PDF links indicates a strategy to distribute further malicious content or lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=what+are+all+seven+roles+of+the+president PDF link annotation
    • https://cdn.sqhk.co/bepoweruga/iaMquic/galaxy_infinity_alien_shooter_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6009e00bc540e.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/idWj8gh/nadurufodofegejimigagav.pdfIn PDF document text
    • http://vnds-v.website/android_tv_box_free_apkuly75.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/6i8nxkg/76754320075.pdfIn PDF document text
    • http://vizionsmc.net/what_is_a_disadvantage_of_the_trichromatic_theory_of_color_visionsd0ru.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/I3jg1jf/51541863945.pdfIn PDF document text
    • http://smartcoin.design/tuv_rheinland_iso_9001_logo_vectorvtu1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_600d80b063665.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/iBgdWjh/repafekalepebefodir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6046744692da3.pdfIn PDF document text
    • http://energytik.net/27902838252xbwdw.pdfIn PDF document text
    • http://manybigs.space/xidilagegedojnr7x8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_32c9b82871154904b153bffc8ce4c0d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efebff1c-ecde-4705-9a00-3250e36166b3/juvudot.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_60a1b5c615274ff9a5bb16169045cc55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65401f31-a48c-435b-b5e4-e0e029c3d311/65268572117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930299e1-b3b1-4102-bba6-5487fa0e02c6/59277609406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53be8fc1-22b6-463b-910c-03be588c4df3/15548677885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe04a59f-28a7-4592-9503-595c9860a2be/who_makes_the_most_reliable_zero_turn_mower.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_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 5200 bytes
SHA-256: 1f511c77bd6344722a9425ac059205e29a141b7a904743e01c4b692169b8b74e
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 11120 bytes
SHA-256: 61f8d4591a978551851af9ca4d4e72b4d5f6263c99c57abf0a5e341f29fd1e18

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