Malicious PDF — malware analysis report

Static analysis result for SHA-256 4987e183188d1b99…

MALICIOUS

PDF

84.9 KB Created: 2021-04-17 21:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e79e6dc5d0071aec9f930318725c1a3 SHA-1: 46f502ccff5fcf447901a8fc0eea8a97cc12fe42 SHA-256: 4987e183188d1b9958ffad5d00c4ca6e7d0dc364381f5e4ca3d68dc428085f1e
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a Yamaha AV receiver manual.

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://soxebez.ru/strik?utm_term=yamaha+av+receiver+rx-v373+manual PDF link annotation
    • http://repair-telefonov.ru/devasaverosenuwijuwaiq31i.pdfIn PDF document text
    • http://thesalle.xyz/85860802058jdiw9.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/caballo_de_troya_5_cesarea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_6009403875515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_606dd59177eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_60605877b914c.pdfIn PDF document text
    • http://kukushpa.fun/chrome_android_bottom_navigation_baricmc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eca5f1e-9f90-46dd-9e77-1436e93b5b6c/35184271917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54749cbe-7cb3-4ed5-b2f5-1046ac7a8c66/chauvet_intimidator_spot_led_350_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2bf0ed-a15f-4f21-8c18-d66979b18112/husqvarna_223l_weed_eater_fuel_line_diagram.pdfIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_8a14e4efd253400598aa129e9f71e982.pdf?index=trueIn PDF document text
    • http://nebojemesiwi.atwebpages.com/one_ones_other_another_exercises.pdfIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_77deb49f98fc4540bbd6b1b66f42a5f8.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_81f5a0aeba514ed1be917a31a159f63d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efd3db3-2b59-4910-9450-e8450062936d/what_lights_should_be_on_my_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5a2bbf-b77c-4a04-a486-749774c061c4/what_are_the_key_elements_of_writing.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_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 5224 bytes
SHA-256: 04181ad7ecf057d5e5a5a3843df020ef6e6ca47efbc796f5a088133fd8df4be8
font_01_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 11212 bytes
SHA-256: 9b09f15b98064d37e45272d96f9a50ec9c1fc9d9efd7bfcf2a0804a484c736b9

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