Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a56bf5c3cb2f42…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 15:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5130f117350ecf77ac42ef90139148d8 SHA-1: 09829cfd8ce2ada97188021f48c309905b7a7cd7 SHA-256: d4a56bf5c3cb2f4276a1978b1c37ba790989378dfbc04a46a46a260f02c7311f
186 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 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=bonobo+git+server PDF link annotation
    • https://cdn.sqhk.co/pemoxeriko/cAOjiav/8342669708.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/hahbUYM/runnings_st_cloud_mn_opening_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_5fd2d82f3e29e.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/jg4z2gH/diablo_3_death_s_breath_auto_pickup.pdfIn PDF document text
    • https://cdn.sqhk.co/bawevabob/ibzljig/battle_islands_xbox_one_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/fidasawon/cPjfWia/43980468803.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/ngigheb/54064536106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_602f7dddb65f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/heise_notepad_portable.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_0dd12fcd53474212a6551d3196c6c27e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36f14e2-bded-459c-ba79-52deb9d9058d/zodamisajuninemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9481284d-d968-4706-a043-2cfa399913c2/luzanasuxukojimal.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/formation_conducteur_de_bus_avignon.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_814c4fd8c37f4553a4781006a1dbba0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/66288657586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf67605-842d-4917-bfae-118d4a2c6f31/pabolitaxojanusetowe.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_84c9dbae964141108636b21fb0c63545.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1666f820-2a7a-45ac-9e89-c045037be64c/xigakomorifufolofawoxezi.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_a93778c175824f2db0771c945ae43606.pdf?index=trueIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_3cb090f076f84cd498c05c381b277cc9.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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 4860 bytes
SHA-256: 5f5262718e11ca6c239191d6e95fc92f89a42012d29421922c0e5a6bbb61d0fb
font_01_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 10768 bytes
SHA-256: 82c9122410737c24cb728cc6f0db957fcb49f4ade2804d7f26bcf01bd529bba0

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