Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4dfeb2fa98dd35…

MALICIOUS

PDF

138.1 KB Created: 2020-12-26 22:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 16e9a80d567396a7b98952480fb3ecfe SHA-1: 932450a8fbaf2bf1b77422d580e939cd4e489099 SHA-256: 0e4dfeb2fa98dd35705be1bd45ff2c4e32672fb81a321d9f882f9a298a10128e
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://trafffi.ru/aws?utm_term=warhammer+chaos+knights+codex+pdf PDF link annotation
    • https://cdn.sqhk.co/faresawuf/fibhjib/jafinozabifopojunub.pdfIn PDF document text
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/7896021.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/xiwotipikuvikoto.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/pibakesizel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fdd4a315ac13.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/snAjhjg/game_of_thrones_characters_season_1_to_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f8eaccf52c0e.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/3a51b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5fb9e79388f83.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/4509029.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/4105682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67ee95355a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5fb2f2e4316fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5f9a80bad8992.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/61644.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/nilafafakem/shadowrocket_android_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/60770651462.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_off0001e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E112 5684 bytes
SHA-256: 9b25ff453a4efa476ce207c9bab3f785eee93c219c6e9e96c8787724a03fb2ae
font_01_sfnt_off0001f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F44B 11576 bytes
SHA-256: 02775da25817d5d32510b1450018087b6d117912e1a9ff0ad6029e9d369d6d73

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