Malicious PDF — malware analysis report

Static analysis result for SHA-256 2218a7b13c356c99…

MALICIOUS

PDF

60.5 KB Created: 2020-11-19 22:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: aef4818846fb4229196c6d7e1c46e0da SHA-1: 90fe17c17947ea77a658da99cd86984ee36900f9 SHA-256: 2218a7b13c356c995ea18bae535252a8fc7f681b68a59a16ab32f891b1b9d765
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 0.9994

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://trafffi.ru/123?utm_term=the+great+gatsby+worksheets+answers PDF link annotation
    • https://kagixopobexumel.weebly.com/uploads/1/3/4/6/134648921/1e28f7.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/mawaniginojas-katonezuvizuwij-lupixire.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/c2222271.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/pofipilusija.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/rowefipojupuziki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8939e68e554.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/5e330c09-c1c9-4c3f-8e4b-ad41710421bf/wasukeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ff3dfe-f203-4199-8c67-6cd9ffb09a99/darkest_dungeon_wolves_at_the_door_map.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/mivevepewuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ec3e95-ba6f-4535-8690-b15b88174454/arduino_programming_tutorialspoint.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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 5260 bytes
SHA-256: 91c40d1dc98ce0156e5121cdae3e92d116e944ba65305719b82fb637f93166ef
font_01_sfnt_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 9472 bytes
SHA-256: 06690aebeed0aac6ea48bef3a7a47e9b2f29b331fa526c250e1b32f5a01993b8

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