Malicious PDF — malware analysis report

Static analysis result for SHA-256 624af428f28a0ad3…

MALICIOUS

PDF

120.4 KB Created: 2021-03-30 20:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2bbedd1f6525461b74e1e4c710fb033a SHA-1: 58fbcc2fb579204a4dc71e8e30e62b39499f0bd8 SHA-256: 624af428f28a0ad3682f4656f61b136afddb04baeb6d2c34af1527a33da2c637
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with several pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to academic research, likely to trick users into clicking embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=ontological+and+epistemological+foundations+of+qualitative+research+pdf PDF link annotation
    • https://cdn.sqhk.co/xadowififux/6jjoOfh/jevirop.pdfIn PDF document text
    • https://nikonewakudofu.weebly.com/uploads/1/3/2/3/132303001/6aab355.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/g8ygdzG/camera_for_online_teaching_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fff710dde9f5.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/5292d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369149/normal_5fe34977237c6.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/gcOXMN7/21214018594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_600ca1f362937.pdfIn PDF document text
    • http://zejijinaw.iblogger.org/jopuxis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5fc5cc8ba5265.pdfIn PDF document text
    • https://cdn.sqhk.co/gozafavapawu/hhpZIig/wild_wings_near_me_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/xafazunusa/vjfSgdg/78471085291.pdfIn PDF document text
    • http://silokegawup.iblogger.org/maya_angelou_biography.pdfIn PDF document text
    • http://gisibud.22web.org/firuresaniwirupibo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5fc8ac6125564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/fingerstyle_guitar_christmas_sheet_music.pdfIn PDF document text
    • http://xupafokivudaked.rf.gd/article_19_2.pdfIn PDF document text
    • http://jezedor.epizy.com/81670627297.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/12641640124.pdfIn PDF document text
    • http://jatomije.rf.gd/nevivazuvokalol.pdfIn PDF document text
    • http://gatoruvizuzil.epizy.com/jeppesen_a_p_airframe_textbook.pdfIn PDF document text
    • http://sekupudim.rf.gd/lakewidugumigawi.pdfIn PDF document text
    • http://kizawudeto.rf.gd/ajooba_movie_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/912789019.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_off00019505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19505 5780 bytes
SHA-256: da6a52a7bf003d6357e54d0bcc216d991dec20e47c0549da680193a563b05695
font_01_sfnt_off0001a88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A88D 12400 bytes
SHA-256: 8a8b74704fa592c1ba2925c4cb4216d430501e8dd35f8d3a75678bd2f1a48a6e

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