Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbcf2687f9e3f64…

MALICIOUS

PDF

102.6 KB Created: 2021-03-15 11:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 060ad5088b1b3d0a41d30b4f88803d04 SHA-1: 530c7961510d6975b8eb0f40388dd8fd2951e50d SHA-256: dcbcf2687f9e3f641b50c0baa7f0702a0090dcbdb7de32ff1060188da8ae6b47
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=is+one+punch+man+a+good+starter+anime PDF link annotation
    • http://rasudilikid.mywebcommunity.org/27466523440.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/amazing_grace_alto_sax_sheet_music.pdfIn PDF document text
    • https://jiwejezagaxu.weebly.com/uploads/1/3/5/3/135325467/3803702.pdfIn PDF document text
    • https://rutizinudepedo.weebly.com/uploads/1/3/4/4/134483735/tuzorewuru_xoguwo_ridapoge_juridolekasidu.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/etDaspg/rorabojil.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/vIhdjgI/creepypastas_skins_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/mirusopujame/eIhi2ia/access_ok_stickers_california.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/Pigib3e/hockey_teams_nhl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_d46463f066ac49a3bd49ad3530a8dea9.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d38d2efa66a54326b3fc7c58b070a60f.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_10463e24eb2a41b2bca50e76b414247e.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_6f582d59eeb24a9790d0d355ed79b4b7.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_4bd34b1f33ed4bbfbec35e42d0916071.pdf?index=trueIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_ec71d77c41714eb9b51f32bae762293a.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_e7f7db7cbb95448ea0976bd2917f71bc.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_75ee569951e440848000354e13952ec6.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_36892df30f6f4413ba1182c8a3bf1588.pdf?index=trueIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 21004 bytes
SHA-256: 7d7cc164fcebb4b5cfaff7b6830d2a4baa846ed51971c76b708536391b48cd2c
font_01_sfnt_off000132fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FC 5276 bytes
SHA-256: fdfbd4eef7728c4dba7b2289e139d548035e9e0cbebee97f5f7856f2245dd09f
font_02_sfnt_off000144ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 10696 bytes
SHA-256: 5659f09b8a8c9515fa3287679903813a77bd45573edb1a34288453b599162028
font_03_sfnt_off00016906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16906 16076 bytes
SHA-256: 264b3f70f4b20a7eafbfb02fa5e91f118301ee00153d0e95f80fb54806ff1939
font_04_sfnt_off00017db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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