Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aba4e3e63a590fc…

MALICIOUS

PDF

68.7 KB Created: 2021-03-31 14:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aeaa14a146326693d18c1cb3e2091248 SHA-1: 8b7574f4bcf5e6e03db56e5b727868a5ab40c795 SHA-256: 8aba4e3e63a590fcd61a9778a0c25aa1baf938d252b3f8d865034818cfb2ea02
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 0.9998

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://soxebez.ru/wix?keyword=words+starting+ch PDF link annotation
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/nadikukilaneposu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_60520c6b61305.pdfIn PDF document text
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/8133711.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/doxaloz.pdfIn PDF document text
    • https://kijenelix.weebly.com/uploads/1/3/4/6/134612576/8511116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_6058e49f9e107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_6050e05b2813d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_600e50d4112b5.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/jimekojumag-deradoxi-wafilapidu.pdfIn PDF document text
    • http://sacredname.ru/smart_charger_for_car_battery3hqgx.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/kuponu.pdfIn PDF document text
    • http://matcobzor.ru/172436148030jmfy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e7cc64-85c8-414a-967a-615cf3ae017f/62264258957.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/8649704279.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/57552280555.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/how_to_fix_aurora_paper_shredder.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/how_to_reference_a_movie_apa_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2607e145-1c6f-4552-8062-204330ed05b4/padasalilevonevuwov.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_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 5180 bytes
SHA-256: 82e8a640efcfd6dc5b7c39ce7cbcec793b3a8a688ec365f077c1440ccb443cbe
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 10852 bytes
SHA-256: 98507974a932535f7d0ddbbd1fc1fc22b2cf9c37aecc981bc5ff262f1754f63c

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