Malicious PDF — malware analysis report

Static analysis result for SHA-256 03df90585d709f43…

MALICIOUS

PDF

80.5 KB Created: 2020-11-21 17:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: de886a18bd91de189e251842a417d482 SHA-1: 9cd150c5079c8daa04b3f1eb38488c668cdafeee SHA-256: 03df90585d709f43ec12759e30911f592a50bf729e8bf41427761f49b48daf1f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, appears to be part of this redirection or phishing attempt, likely leveraging the 'Wii u library' lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=wii+u+library PDF link annotation
    • https://sofivowipaduru.weebly.com/uploads/1/3/4/4/134454637/zuxigotuf_zanakeme.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/3022ce36.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/3719275.pdfIn PDF document text
    • https://vudiwajexisipu.weebly.com/uploads/1/3/4/0/134096418/7454743.pdfIn PDF document text
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/tetosavifojenomakuzo.pdfIn PDF document text
    • https://nijomusuvul.weebly.com/uploads/1/3/4/6/134671469/0d2292e7c8ec250.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/derux-dibatanusaxu.pdfIn PDF document text
    • https://fapadeli.weebly.com/uploads/1/3/4/4/134445247/7372291.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/bevekizadoxuj/52316124001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1736d9a9-adb2-4eea-8220-856b7ccd55a6/xodis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b6e475-f9ee-4fd0-a07c-0c0840bb921c/henrico_county_public_school_calendar_20-21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b564404-f677-4872-8944-cbc002e26081/gajobe.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_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 4756 bytes
SHA-256: 846f81ccdcf79177a54a8e22b50da39b985ee12a2d5488ea1a85722c9bcb4fab
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 10988 bytes
SHA-256: 79beb7f897dcd21a9517ba2f97a525620ddfe375d8cac61cd35c99d70b058018

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