Malicious PDF — malware analysis report

Static analysis result for SHA-256 375974ad9ce83e80…

MALICIOUS

PDF

100.9 KB Created: 2021-04-17 12:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d7caebc11e4f6a3d50f5180647c2cea SHA-1: 58bbd48f6ff685381a712dcfceb591cd66da4eb9 SHA-256: 375974ad9ce83e80e9c812e369d9c2db069938e370bd9e8261f541fe604ab7e4
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Fake CAPTCHA' heuristic suggests the document aims to deceive the user into performing an action, likely to download a secondary payload. The embedded URLs, particularly the one pointing to vilenefex.ru, are suspicious and may serve as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://vilenefex.ru/strik?utm_term=snow+white+with+the+red+hair+episode+2+english+dub+season+2
    • https://cdn-cms.f-static.net/uploads/4477139/normal_5fd99cc1cd1ad.pdf
    • https://cdn-cms.f-static.net/uploads/4383928/normal_604f7b5b68270.pdf
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/7851220.pdf
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5ffa68c449023.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60174e865ad5b.pdf
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/gofuxofowuj_zonudeligoz_tinalame_buwebetag.pdf
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/5f1d8844730.pdf
    • https://zedalikekotax.weebly.com/uploads/1/3/1/1/131163955/wevexe.pdf
    • https://zezevavibafano.weebly.com/uploads/1/3/5/3/135325489/kodojufupixudopizup.pdf
    • https://cdn-cms.f-static.net/uploads/4482402/normal_60146efa18a10.pdf
    • https://cdn-cms.f-static.net/uploads/4388283/normal_6066cfea22871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72be5e1b-4d14-4335-96ee-88463f604c48.filesusr.com/ugd/57ecfe_81ce60aa8cec43ed9e5d86fc2457efac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5f3621f-b57b-4d53-a182-d7d4ee5da7ef/graco_4ever_all-in-one_convertible_car_seat_-_cameron_manual.pdf
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_568ad464f3674df49c765d0f4af6dd16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7c20d5f-1bcd-4841-b1a2-de0943f8840a/folijaroxaded.pdf
    • https://f5ab370f-1445-465c-ae0a-adb246d340ff.filesusr.com/ugd/2d95ce_7c3c00bd4b604007b1879416a1ddfc8d.pdf?index=true
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_61f31b3d927a4d55a05bab752348e648.pdf?index=true
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_56906d85081643b1b2537d76ab9cf9b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/32322457-9cb3-419c-ae10-ad15ca30f60a/tuverilevutavewadivav.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a28.bin
9950a20f0ff4419e2d635790f6879cce5ffe8569e15ffc9542b1311eb48a4650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 5656 bytes
font_01_sfnt_off00012dee.bin
ad77c74f1aefbb9cfb00353d4265e023201af7198099c4763fd3390899d00dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 5688 bytes
font_02_sfnt_off0001414b.bin
4cea888cf9ca47bd87bf470d48adb97022b8e7edeabf0207b17df8bea2836716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 13360 bytes
font_03_sfnt_off00016c13.bin
82cf4eb7d8182765c7a490918353c0ca161c350f8f15771a15a7ab05700a2390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C13 17252 bytes

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