Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fa339106187a77…

MALICIOUS

PDF

65.2 KB Created: 2020-11-19 22:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a9d8e5a90df83d463fd719704244c8fc SHA-1: 1c65009497ea2214cd11df061f9ce976f8b62c52 SHA-256: d1fa339106187a77e83cd41b7935388f04abfef03908ad71ee1202ea1414a33b
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 0.9997

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://trafffe.ru/123?utm_term=hardy+weinberg+teddy+graham+lab+answers PDF link annotation
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/sipidifumip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f90a3e62a44c.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/1588769.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/bbf4e1.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/newigopogikimapared.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_5fb43c29159f1.pdfIn PDF document text
    • https://jamisovuropasag.weebly.com/uploads/1/3/4/3/134396730/foraxagoriv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/59ce56c3-c23b-452f-a763-4a549b573c0a/13925093186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf90bcb-87cb-4829-97be-9a05c061b97a/gibisurimaloz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748cb87c-23d9-4df4-9af0-9a0e91d5b347/xejik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19135feb-7fdc-440b-ba37-3f17ebe2bb40/gorikizetazujabet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D7 5212 bytes
SHA-256: 3b100c517bec37e2517667cba39ac13f3d157294767c6f3fc8600d2e0d41913d
font_01_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 9592 bytes
SHA-256: fe2d499a5b3ab0c54c0ae333abfa51cd4230d3a15ff93e5a4b4ee20b410f70c5
font_02_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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