Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d885710b08eaa31…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 12:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a6a6f9677771dd011088855d1deb7b7c SHA-1: 52b5ed8d29b69cde8adf862c406fcfb964f2fd18 SHA-256: 6d885710b08eaa31d36459d90b396cd07725a934756b78a1adf22d178f1bd888
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs likely serve as lures to phishing sites or malware downloaders.

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://midufefew.ru/award?keyword=mathematical+statistics+with+applications+answers+pdf PDF link annotation
    • http://roboludawu.mywebcommunity.org/high_probability_trading_strategies_kora_reddy.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/dajana.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/kimoruzada-gojagukakibugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_600fba9651aa7.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/OQVshdJ/battle_angel_alita_last_order_omnibus_1.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/iaL8Z4o/2019_rnb_music_free_download.pdfIn PDF document text
    • https://nepimofuniwud.weebly.com/uploads/1/3/4/5/134508881/tosumotato.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/95375628880.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/blank_map_of_central_america_and_the_caribbean.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/samularagab.pdfIn PDF document text
    • https://gikijeza.weebly.com/uploads/1/3/4/4/134465371/024c58db01c.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/68432008474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6029d03885574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5ff247aec6125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/311e5018-3b4d-42d3-8b3c-bf2af4d93598/sword_art_online_season_3_episode_1_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ec5c74-aa27-4957-8cb3-511db95a118b/puzasibidabagezoserum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2598a466-7215-41f3-8b07-ed7b1a7ee941/meade_etx-80at-tc.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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 5492 bytes
SHA-256: e538353e49550f166d7bfac6c235af47547060dc45e8dd78c281a3c81df0bc7e
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 12340 bytes
SHA-256: 186edf72976529f014fcb1dc3e26ac26ec67fcb4bf298bb2de4606918d3ea991

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