Malicious PDF — malware analysis report

Static analysis result for SHA-256 71322dd7f43eb5d6…

MALICIOUS

PDF

70.4 KB Created: 2021-03-22 06:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be1fbb6cd0bbf58b9dd618ef1a09f7e1 SHA-1: 9c806d75027eb2696f4b9dcc2a1dbf1ee19e95ef SHA-256: 71322dd7f43eb5d6b309466015963a5dea31179d16d3403eaef546629c1a163d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or phishing. The primary malicious URL identified is https://midufefew.ru/wix?keyword=d%2526d+charlatans+die, which likely serves as a gateway to further malicious content or phishing pages. The presence of embedded PDF link farms and external URIs points towards a tactic of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=d%2526d+charlatans+die
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/tozalujivumadav.pdf
    • https://vonebofakakare.weebly.com/uploads/1/3/1/8/131856314/pubavikugedobiw.pdf
    • http://budivev.scienceontheweb.net/urdu_to_bengali_dictionary_free_download.pdf
    • https://cdn.sqhk.co/mafowixodi/Ahejgdz/92128485516.pdf
    • http://jasetukuxazep.22web.org/zoduwitesalabo.pdf
    • https://cdn.sqhk.co/nabowixufori/8gi1jeL/kannada_janapada_love_feeling_songs_free.pdf
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/8277938.pdf
    • https://tokinuxo.weebly.com/uploads/1/3/4/8/134848772/wuzadigutik-zoboxubitubul-rasetoxilif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4b54e8b-2ff6-42b5-87a2-5ca89fa2cc5f/is_canada_market_open_today.pdf
    • http://duvodix.myartsonline.com/megabesumaze.pdf
    • http://lazuletezofik.onlinewebshop.net/presuppositional_apologetics_books.pdf
    • http://vigigizumobake.rf.gd/50160076648.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_65c2bc8eb9064ef6a08dd8eedad3e6e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77a83fae-e0b3-45ca-889a-71e85ab6a86c/sulujipezutak.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_a1af378a62b44f0f8d9141cc44bc7a8c.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_f0d099c5f9104183b2971ad9d9efc9cc.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_d49aa6f6c3604624975b2ee3ec397d56.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0eec50d6-4eb7-449d-82c1-f5aae2816fc3/fokolaxupaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc37.bin
5bcf7f318894cd8667f709bf970fa8c582a8027402ea75fdf14ac0e15260a4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 4156 bytes
font_01_sfnt_off0000ea65.bin
a1314e915f1a8919da7335635f369a523457fe949a2537b7cf01a1eca5918833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10192 bytes

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