Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cce72ecfab2ad2…

MALICIOUS

PDF

78.7 KB Created: 2021-02-07 11:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d061150985eb01b42c61f2c567dd148e SHA-1: 0189ef82f3c4bdfbe57488499de270d6aed9da5e SHA-256: 88cce72ecfab2ad2cf53224387c2fb5c5838d27e4eb38d626c9fdf012f739dbb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or malicious redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=draconic+evolution+energy+core PDF link annotation
    • https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/797f578d1.pdfIn PDF document text
    • http://slmit.fun/christos_anesti_sheet_music4g4m5.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/5834686.pdfIn PDF document text
    • http://netzamka.ru/ladadazixorintus7m.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/giibfgj/800_words_season_2_episode_1.pdfIn PDF document text
    • http://airet.space/dilaxubofederipu20.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/lgffLgf/27532974871.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jjcigkV/princess_and_the_frog_costume.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/7648159.pdfIn PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/7e730747401.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/gdijjei/30853682209.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/lanaladu/zawurabewofebaxavokigot.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/stranded_deep_game_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/zasobodedaxur.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/indian_government_calendar_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/dream_on_the_voice_judges_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/les_vtements_en_allemand.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/carburetor_function.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/recommendation_letter_format_for_primary_school_admission.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 4948 bytes
SHA-256: b1c2aba6cbb0244cb2267011a4d9b198e058e6e1ee2c8746e32f13500b5927be
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 10592 bytes
SHA-256: 8430dd87af2fb7d557792775bd9cebe6a9fabaeb357401361a9204754d5c874f
font_02_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 16036 bytes
SHA-256: 0fe8aa14d08365d6f8b61b1bc8ff310bb462f18a21f3c7286266bd86e60ec020

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