Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4606fe90412192d…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 14:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df3cacd8614fc4ebe408c8fe7cea169c SHA-1: 3df40f1257d10ded88007b856259eee5df1bcf75 SHA-256: f4606fe90412192db2a63777fd2ece444149b30cc5db682a63e20f0e5374a762
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://ponafet.ru/123?utm_term=vidmate+ios+12 PDF link annotation
    • http://musofiron.ru/kosamusuv1t7b.pdfIn PDF document text
    • http://zuvels.xyz/vofulakaizz.pdfIn PDF document text
    • http://electriccannoz.club/top_2020_songs_countryxqdcx.pdfIn PDF document text
    • http://mirror-x.org/joker_movie_script6ctgd.pdfIn PDF document text
    • http://aicberg.net/1407992695oftf1.pdfIn PDF document text
    • http://rezltml.xyz/jozewugcr3lt.pdfIn PDF document text
    • http://deine-gabe.com/carol_of_the_bells_ttbbhstzy.pdfIn PDF document text
    • http://reduslimitalia-official.site/48069020533puqpn.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/216c506f-535f-4926-aca0-a0e2c37a51cf/67743056946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8b2313-fe44-40f6-90b6-520837901f4e/par_quoi_remplacer_le_cognac_dans_recette.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5a01f8-2659-47c5-a541-0ad5e7ea6131/20541965661.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_a4dc672d4fc74d57b81e5e7d2b01b028.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca641493-4c7f-4ce2-a8bd-864ebc007cf0/12028621962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bd4b03-24ee-4695-af5b-d0c0deea1e74/6560235300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95682246-82b7-4e0d-9ed4-8aa1120af2f2/kodamuxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5346d60f-f79a-4d3d-91ca-3c9398ff4ebf/2015_nissan_sentra_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d862b5-9990-4eb6-8c7e-f5968fa8f897/26214548810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b793abd-19f7-4183-a631-f0e31b15ee15/xavaxoxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9bdb626-d479-444a-96c5-795f9a8dd975/76542748032.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_6f95059eaf414a9987525b97a4ad32df.pdf?index=trueIn 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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 4992 bytes
SHA-256: 82316b6f518d10c1b3a177c32dc002bb35672083d53e4b113778e191b122f17b
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10484 bytes
SHA-256: 8aec207d88599be9e4c7383285089ba0f18367ad45f5a745470416df20fe447e