Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c80cf6b853b251…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 06:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1991329df3bc78427fd834d3a3fbebb SHA-1: 75b76e132066039dd86ed82fc5843d46ad6b2666 SHA-256: d8c80cf6b853b251725ee172d0855334bed40f0c36b51c47ca076d5c1bc0b2fd
104 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a resource that is likely malicious, as indicated by ClamAV detection and ML classification. The document body, though heavily obfuscated, appears to reference a service manual, suggesting a lure to trick users into downloading a payload. The presence of multiple unknown reputation URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=2005+yamaha+yz250+service+manual+pdf
    • http://therarbooks.com/jetuxagovujufudodg3dh2.pdf
    • http://komarovskii.xyz/how_to_put_together_ingenuity_automatic_bouncerddgad.pdf
    • http://xalebiru.iblogger.org/36302392239.pdf
    • http://mirumumavetifun.mypressonline.com/16262795909.pdf
    • https://cdn.sqhk.co/gukisafuw/5gdiigi/hashtags_for_likes_review_trustpilot.pdf
    • http://xilutemomeliro.iblogger.org/bsimm_9.pdf
    • http://xepuxesadara.mypressonline.com/adhd_test_for_adults.pdf
    • https://cdn.sqhk.co/vuzefegevo/cha9Zje/free_cable_tv_apps_for_iphone.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/89737967176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d66787c8-5132-473c-8b40-ec6f456d61c2/conflict_resolution_techniques_ppt.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_3cd27ef2a0b24f7ca730c5a32b7a49d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15ce9b51-f537-4dbd-8ea4-801307d2a8e1/nancy_drew_2019_season_1_episode_10.pdf
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_862dd894848d4384b5e27764aaa69e31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13aa5e08-1585-4055-90b5-a2ac6ec5d721/ea_sports_ufc_2_mobile.pdf
    • http://xakagigoneliv.myartsonline.com/when_was_last_new_moon_2020.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_bdf7c59424e945c3926eb56219395808.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4cda63bd-f047-4f41-9ec6-900c637173d8/what_modem_to_buy_for_centurylink.pdf
    • http://pasifowon.atwebpages.com/the_witcher_3_ps4_manual.pdf
    • http://diturasenupope.epizy.com/mawafoteporuki.pdf
    • http://vipodozuwuwo.epizy.com/quadratic_formula_practice_worksheet.pdf
    • http://gukasitaxe.epizy.com/alfa_romeo_giulietta_2016_brochure.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e442.bin
6ddad2b71958c932173c9a1da226cc1c611bb1d59f7633754017488861442210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5908 bytes
font_01_sfnt_off0000f851.bin
17a3510eb80a79a2803842cb9f778ea8a804448a41c5badd6806e92b9f1ccc9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 9816 bytes

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