Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a41b9ffd1b076d3…

MALICIOUS

PDF

81.8 KB Created: 2021-05-16 00:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5b304d322d15d59207c09995ed96c79 SHA-1: dea747cb00debb8abd8c2a38391e9a6839d5ec64 SHA-256: 4a41b9ffd1b076d3ec5b0c847399ab4d161c7e1d8023c34854f90281ca6d3f29
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://dafemum.ru/strik?utm_term=weed+eater+riding+lawn+mower+12.5+hp PDF link annotation
    • http://kofodotig.sportsontheweb.net/garaf.pdfIn PDF document text
    • http://melidagerukebel.sportsontheweb.net/apostles_creed_in_english_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_5fcbff75dcd39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff0a30d6d0dd.pdfIn PDF document text
    • http://bahis-sikayet.com/15292148187o1syo.pdfIn PDF document text
    • http://bioforce-co.site/lelusesiwirejazuzuzogh2mb.pdfIn PDF document text
    • http://servisvds.ru/18383368820t312z.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/lang_leav_books_list.pdfIn PDF document text
    • http://e-sparks.ru/king_kutter_6_finish_mower_blades6gjr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5ffc664b4981f.pdfIn PDF document text
    • http://pixizosusonaxij.sportsontheweb.net/39579645874.pdfIn PDF document text
    • http://islta.fun/5196180271svh92.pdfIn PDF document text
    • http://kawlites.online/how_to_turn_water_heater_pilot_on7uiex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/what_can_alexa_do_on_fire_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5440c7-4994-4d02-879b-abac76da1555/why_does_my_garage_door_not_close_sometimes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5ff7f4-9e8f-43c2-9ca8-4c9b25787e38/nudanipisawokivapazereno.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/english_test_b1_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e626666-9675-4ee3-9db7-6c8ce31f4972/63637204846.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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 5640 bytes
SHA-256: 8bfd0ba2f6509904dfb653e1de53d2ee5b4e45fed15ff82fc87b6f0a652d9829
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 11168 bytes
SHA-256: 702667e1be5881aee6ac6e3568e0e4bbe5856a1191a60a30f1d4b78bdf6ae055

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