Malicious PDF — malware analysis report

Static analysis result for SHA-256 133a9e6a027dea30…

MALICIOUS

PDF

65.7 KB Created: 2021-04-04 13:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cc49c46329881aa40de8091a3213a2fa SHA-1: 5014c22b38c4068132e559bc4cac77b9254c878c SHA-256: 133a9e6a027dea30a957655d8c84aa1ab918cd396e196c3fccd8a73d3608290f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with several pointing to suspicious or disposable domains, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URIs indicate an attempt to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=calories+in+common+foods+pdf PDF link annotation
    • http://5coupons.info/214432294973ozh2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_6066fc51410bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_603fde9909aaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5ff8edfe77e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_6030fe6026445.pdfIn PDF document text
    • http://vetizivonisare.22web.org/64732782253.pdfIn PDF document text
    • http://pe50off.info/ladorusawesevajuj73yz7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6068963381712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5ff45114e08e5.pdfIn PDF document text
    • http://kungfumalibu.com/black_diamond_headlamp_replacement_strapl0pkc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_60260834f325c.pdfIn PDF document text
    • http://nosinoski.shop/kivemezebijisirogiwiwomehw2u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403282/normal_6006da302bf02.pdfIn PDF document text
    • http://soinjaga.ru/war_of_the_worlds_chapter_7_book_2_summaryh0te1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_600c69392756a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_5fe78bdc856ea.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/86245c76-838c-4c00-a143-fc44a90b2ac7/what_stimulates_hgh_production.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b9536a-f608-4a90-be9e-971d8f7ec47d/warhammer_40k_first_strike_starter_set_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536c0aaf-f97b-4ece-ba1c-b92f5538012a/dorian_gray_storyline.pdfIn PDF document text
    • http://kabexumowexugu.epizy.com/22311551544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7ede61-a521-411d-9836-4c7540dbc15b/beginner_guitar_chords_for_christmas_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97fe572-2882-4e50-beed-69ee06879904/reading_body_language_videos.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_off0000c5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C7 5208 bytes
SHA-256: d3352dbb6e77d7a2cd1846108d86b035ca9ad6af35613417f98ab185154d9e7f
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 9964 bytes
SHA-256: 49e3ecf5842a1a0c206f81283a1caed0ad12396026e18d9e0d339b6cc9480b6a

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