Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f9988e22df22b7…

MALICIOUS

PDF

75.2 KB Created: 2021-03-12 00:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a6031bcc6310cdfc7c19e177ecd15450 SHA-1: 52e9b3c269bee151466eef8698b37969661f3cbc SHA-256: 85f9988e22df22b7ecbdb85918bff51e9976125a33808ecc6691e3374519ea44
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=auto+clear+cache+chrome+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421783/normal_60367ac5bdef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5ffe581cb8432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_603c8076cd92b.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/joheUhi/marketplace_insurance_2018_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_6010463516019.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/geighfo/nesuzedakomusorikusafagup.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/Ejjhgij/city_hot_wheels_racer_x.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/iIhHajg/99663532742.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/8SrUifo/oneplus_6t_video_calling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_6047b2d7dcbb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_35fffd7f75b2465d8f8d8582194fbc71.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_b7dd82ddb3d746fb8a00b2d73595ee59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8423aa0-0177-4601-84c5-f306c5f915ac/bokipesexunonugipapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8dd4a74-6005-4c6e-94c7-2939bc475323/summoning_spirits_in_smash_ultimate.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_4fea14cdaf8840b3baba39d36dee742b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f455e3-b72b-426b-8468-8e3f8e86093e/rilozalewunajonupikupepan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c8f7fe-92bd-486a-b515-271cc6295ae2/19942613929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db53ec0d-2823-4567-b35b-61df7ddbfc83/how_much_transmission_fluid_2002_honda_odyssey.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 4988 bytes
SHA-256: 7124d168bc556f085b255016a84af363a11e3c12aba50326f668b298b5bdb9f4
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11432 bytes
SHA-256: 00409e341f9437839528e20c35d08b157deb518fb9dd1c684606824d486ae8a8

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