Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8e419ffdf2a6a3…

MALICIOUS

PDF

73.4 KB Created: 2021-04-02 16:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 099d42bdaf24142dccf96d74fb5ad42a SHA-1: 1102487451d07872a2a50127df3517d0ffec6b04 SHA-256: 5d8e419ffdf2a6a3b7ec5104e24eddb0eb5e10f89aebc7363e1b0a6b9d3142e6
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 0.9997

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://leonvi.ru/123?utm_term=customer+complaint+analysis+report+ppt PDF link annotation
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/0bbdb36e6e91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_602fb4ae7c738.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jghjcgj/mario_game_gallery_soundboard.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/hhNhd4o/89349837857.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/pivaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_603d343531bca.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/7888943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_604e2a4496749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_6039151361c8c.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/coDPjhP/piferudifut.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/beethoven_symphony_5_analysis.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/9562184.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/the_bluest_eye_play.pdfIn PDF document text
    • https://tifajanos.weebly.com/uploads/1/3/4/8/134861866/b12bbba10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/fakumonowape.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_117469e8035b4a098e8a983b3b9ec41e.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_4a15ea3929154c85b615ca2d977de3e4.pdf?index=trueIn PDF document text
    • https://73e8eba8-f08a-4c12-987a-519a82e171c2.filesusr.com/ugd/19159f_c1768b05acdf41348b43944386bda0b5.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_dc5a026d3caa48feb7e623ce02fbb6d0.pdf?index=trueIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_d83a454f553646849224fb9209169a31.pdf?index=trueIn 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 5084 bytes
SHA-256: ecdb0eaacdc6eca259ffa3ec6cccc000813f0f52044017072bf1fec29ff36ff8
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10632 bytes
SHA-256: cf01abc3e4cc178e43a690d0bf2e8c8d74a9d661be71ce78c55e695f02ba5327

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