Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16ecada66b2538c…

MALICIOUS

PDF

76.9 KB Created: 2021-02-23 14:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9511d1d57731213fa6a9312d80a59733 SHA-1: 98f3ed001e585953263b0cf74560dc795373b4a6 SHA-256: c16ecada66b2538c8a173bc706ab01bfb613b126062fcd5a402a17509539a3ba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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/strik?utm_term=ar+15+front+sling+swivel+rivet PDF link annotation
    • https://cdn.sqhk.co/zifeduwa/egRjdhd/redevofivuza.pdfIn PDF document text
    • http://boomua.site/34831450108p92tx.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/1146183.pdfIn PDF document text
    • http://originalhallyu.com/94830230827vz63a.pdfIn PDF document text
    • http://zoompol.xyz/528870149018msys.pdfIn PDF document text
    • http://jilet1.club/16247874343wjeir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_6015a436864a1.pdfIn PDF document text
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/milidularuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fc8a5bb9b6b7.pdfIn PDF document text
    • https://bafuselowazela.weebly.com/uploads/1/3/5/3/135318440/giminimevir.pdfIn PDF document text
    • http://ziviludemedo.iblogger.org/black_and_red_wallpaper_for_mobile.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/zawofovaxalejilupol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_602ac96abd4b9.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gekAa1q/zotofunumajixofewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_6004a2bdca7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/uhhgjge/angry_birds_dream_blast_level_2004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xorisok.epizy.com/letter_sound_worksheets_for_preschoolers.pdfIn PDF document text
    • http://roteniju.rf.gd/papojimunulodogefolib.pdfIn PDF document text
    • http://xoxasosopu.epizy.com/52279214614.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 4828 bytes
SHA-256: e33e96d0f33bfe196182fdc2a24f30b54e16fde5170d82647fd738011b689b74
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10160 bytes
SHA-256: dbafdfc30089d3e3ad8eabcf00be888832ac7a8b13bcbfe077c2b8b19aeb6ec4
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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