Malicious PDF — malware analysis report

Static analysis result for SHA-256 f520e4446b090109…

MALICIOUS

PDF

76.3 KB Created: 2021-06-03 13:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d9d6a9b5adbefcb0f84e34ff891c3d59 SHA-1: ea0819f629c9a5bea48b609946df8e102a8b378b SHA-256: f520e4446b0901093aa075ffd7c40c87e4ed3a07718a64c4347bdec07d631fc2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of an SEO link farm or a phishing campaign. The document body, though heavily obfuscated, contains metadata suggesting it's a 'Coronet blue episode guide', a likely lure to encourage users to click the embedded links.

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://bologen.ru/123?utm_term=coronet+blue+episode+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497082/normal_60418207a0dfc.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/tigugin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fdefa8da932d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_60513aa3ea302.pdfIn PDF document text
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/pubabovezuxofez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_606d638bf373f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5ff947de72393.pdfIn PDF document text
    • https://patajarixeli.weebly.com/uploads/1/3/1/0/131070073/pugenizefaf_ruxovuvepedini.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/duvisemagibi_buxab_japix_guduko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_6052801f5232f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_6014cf834a1d9.pdfIn PDF document text
    • https://sifufunozomelu.weebly.com/uploads/1/3/4/7/134764248/1701ddd1.pdfIn PDF document text
    • https://pejirudofatepo.weebly.com/uploads/1/3/4/6/134648176/3fad5a3b8.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/sabudovuvusifokeja.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/7738097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_6005a64236475.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokulus.pbworks.com/f/mapamundi_con_nombres_blanco_y_negro_hd.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144468252/alcoholics_anonymous_big_book_4th_edition_hardcover.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419148/nuwawujubibokokedadekuf.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/download_lagu_kokoronashi_gumi_mp3.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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 4964 bytes
SHA-256: 808c58692350032de13052ccdf6bb42385bfba227712691cba7543e7471cc3c9
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10396 bytes
SHA-256: 8776b70de389244bd9810fe37826ef3b35161ec121555981872d92658f0a90c0

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