Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc50cb69c76e032…

MALICIOUS

PDF

82.7 KB Created: 2021-03-12 05:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d648bcdefd42bae4e0e1ed8d6df3f0 SHA-1: 779e6201e964deb9c02a511fefeddae69620ad8c SHA-256: fbc50cb69c76e032c3cae712579512ee82d36e047e9c2f0337c422659335c2be
156 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 link farm detection and a critical ClamAV detection. The document contains numerous external links, with the primary suspicious URL being https://pelibifir.ru/strik. The presence of many external links suggests an attempt to direct users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=what+hunting+season+is+open+now+in+ontario
    • http://bagerisevi.scienceontheweb.net/73130549476.pdf
    • http://nakalabaxis.mywebcommunity.org/betty_crocker_cookbook.pdf
    • http://sogejovep.mypressonline.com/what_are_the_three_basic_parts_of_a_newspaper_article.pdf
    • http://lebuvowune.getenjoyment.net/15053168886.pdf
    • http://wewogokuwidu.mywebcommunity.org/the_decisive_moment_by_henri_cartier-bresson.pdf
    • http://jofufunobek.sportsontheweb.net/how_to_construct_an_obtuse_scalene_triangle.pdf
    • http://wupofifaxixusi.66ghz.com/9706461797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9d00299a-ced4-4d5f-8846-bf23ad136044/72998310573.pdf
    • https://s3.amazonaws.com/tisegovofu/rosomarejizarojovawopas.pdf
    • https://uploads.strikinglycdn.com/files/59606ad5-70b3-4b1d-ac79-ecb83cfb5121/22531018794.pdf
    • http://zeroxezubanalil.onlinewebshop.net/reliabilt_pocket_door_frame_installation_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0441e309-1d28-42f8-9fbb-8b5dbe47471c/neverending_story_stranger_things_lyrics_youtube.pdf
    • https://uploads.strikinglycdn.com/files/b7849ab1-a799-4163-b78a-afd413637967/vexemixeniku.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_470fe0ceb0714a4fb326fa80fc854b68.pdf?index=true
    • http://kofaxafogi.myartsonline.com/sub_zero_fridge_repair_nyc.pdf
    • http://rotaduwifomol.rf.gd/arduino_uno_r3_microcontroller.pdf
    • https://s3.amazonaws.com/kujesulad/english_worksheets_for_grade_2_printable.pdf
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_5aa6e609ad3e47a89079b4f368a3de61.pdf?index=true
    • http://furunes.onlinewebshop.net/scosche_fm_transmitter_stopped_working.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc3.bin
9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 2900 bytes
font_01_sfnt_off00010608.bin
87e347de656822455d3c541273c995dc6a4f5c9f37bdcb432485c52732972d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 5152 bytes
font_02_sfnt_off000117a8.bin
d48182f9a6a383ff591231011c725465dddab0c20c634c9d0d96f5cafa6c98f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 10720 bytes

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