Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1c49edc8a98ab5…

MALICIOUS

PDF

87.0 KB Created: 2020-12-24 00:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7818e66e21940fc737618ad361ad5c76 SHA-1: 1ec3986e16e6d1d8a345b2406badcfe9e36e4162 SHA-256: 5c1c49edc8a98ab58a6531533526d5a388bc08f0b448457d463f87a9a7a1d7e1
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://trafftec.ru/strik?utm_term=mob+skins+planet+minecraft PDF link annotation
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/sasepatutadaw_bemumajaduvisi_zatidebuxod.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RNNjhKV/tonewovukadalepukiwesota.pdfIn PDF document text
    • https://cdn.sqhk.co/badimoweba/uPjcge5/kebilog.pdfIn PDF document text
    • https://cdn.sqhk.co/ripigopes/DQ0gfA4/vintage_frogger_arcade_game.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/sigobija/android_ndk_folder_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/vivetu.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/gumuritejakilisojofoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dedace55-160d-4903-901a-f6ce09410d11/patologia_humana_robbins_bibliografia.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/pagorok.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/vulusuwavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad88fb82-92b2-444c-a3a6-9453ee9b56d3/96465294722.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/91890086623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdb587b-03a0-4abd-8a93-744d8097b3f3/29080825582.pdfIn PDF document text
    • https://s3.amazonaws.com/luvamekonivoz/84454236237.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_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 5372 bytes
SHA-256: e965ef7cfbac165b8107c35d151a5138c4e95e78938f3c9cabc4b9a9c11cc4f4
font_01_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 11020 bytes
SHA-256: 327e4fdf7a5ff352f7441521428bcf204c080532e3840c2e72f65c685535850e

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