Malicious PDF — malware analysis report

Static analysis result for SHA-256 0847392d58dc155e…

MALICIOUS

PDF

83.8 KB Created: 2021-03-13 16:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b19d25d17e3ef464b94a6779503a304 SHA-1: 1ed9cb8cbac88fd00b26d2a4c71b754ccd4839d1 SHA-256: 0847392d58dc155e7087973edacc0d93ab1ede54c28f6c0f20d8debfbd02b398
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest a phishing or malicious redirection attack. The document body is heavily corrupted, preventing analysis of its content.

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://resalured.ru/aws?utm_term=kenmore+sewing+machine+158+parts+ebay
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5ff2d9f6eefcd.pdf
    • https://static.s123-cdn-static.com/uploads/4388416/normal_60031accd032e.pdf
    • https://cdn.sqhk.co/nodomepe/4d9jeRN/top_100_stocks_under_50.pdf
    • https://cdn.sqhk.co/tefaxobaf/j3XuJii/dovuduwetanodudobepuwep.pdf
    • https://cdn-cms.f-static.net/uploads/4454041/normal_601ca1dd6895d.pdf
    • https://cdn.sqhk.co/vadavenaw/gc4Me00/guwivuxapabowujonul.pdf
    • https://cdn.sqhk.co/wamedexipun/ljfiKji/red_robin_delivery_coupon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf543b24-be8e-47f6-9266-b83cc28076b1/mujikimimi.pdf
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_b8cde56f06d44ffd96120cfdb9dc0dd2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2349d5d7-31f9-4f2f-b9ae-1710a38a66af/fumuzunivu.pdf
    • https://uploads.strikinglycdn.com/files/9b20af1a-5a44-4f6f-8516-b40328d7dc58/how_to_find_cross_sectional_area_of_a_wire.pdf
    • https://uploads.strikinglycdn.com/files/da05498e-1373-4ba3-8145-b62950e58e1d/69589421413.pdf
    • https://uploads.strikinglycdn.com/files/3619838e-3340-4ffb-a22a-f194b7f9b039/85699384222.pdf
    • https://uploads.strikinglycdn.com/files/cf1ebd96-52c6-4b5a-a360-5e24adbd2dad/travel_and_leisure_bucket_list.pdf
    • https://uploads.strikinglycdn.com/files/2c00a7db-fb53-494e-ba1b-0e6b417e9ca3/visual_basic_programming_language.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_3dd980c73d15497a8ee5e92288892456.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_816657ab77484ab3aaf3f3026ade55f2.pdf?index=true
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_b1b4cd712f984fb692e0020371f16330.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08a2b024-1ce3-4238-beda-42d88169ba07/how_to_change_date_on_citizen_eco_drive_perpetual_calendar.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_off000106d4.bin
5ea15cc656a0747deddef2a5d35d9d9500a4dd2204b03cf635d4ff0658d8d57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 5988 bytes
font_01_sfnt_off00011b2a.bin
a4ef829a429ea9cc44f9ae69afc352712c36120ea85130652eb69730cc51d693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 11028 bytes

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