Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5680abfe872b68a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-27 17:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bbb69e70f2187da4a60fbf112a0df1b SHA-1: 142d6c1a4fe6be14ab8f418b2bb4e7764dd93cd0 SHA-256: a5680abfe872b68a932dd9e26442bee961fc4c38794438e401647638848c1396
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=what+is+eligibility+for+indian+navy
    • http://ximilakuxulo.iblogger.org/butrans_prescribing_information.pdf
    • https://cdn.sqhk.co/vusutesilo/Ffjhmoo/renewal_passport_for_minor_form.pdf
    • https://cdn.sqhk.co/toromerepowa/jifjav7/61993054737.pdf
    • https://cdn.sqhk.co/dubutemaruxu/aggD5of/the_crossing_columbia_mo_live.pdf
    • https://cdn.sqhk.co/vifamepupib/9Ytdon1/pioneer_style_architecture.pdf
    • https://cdn.sqhk.co/zojoguxuban/ZgjUheo/sad_ringtone_music_only.pdf
    • http://laura-egorova.ru/towopuzmvivu.pdf
    • http://doporem.22web.org/is_nissan_service_open_today.pdf
    • https://cdn.sqhk.co/gumakulex/dDYlgfm/83841569355.pdf
    • https://cdn.sqhk.co/joxipadij/WiikjeX/smartwatch_with_offline_maps.pdf
    • http://appeal-ig.com/how_to_determine_boiling_point_molecular3iips.pdf
    • http://com-signto2.xyz/easy_and_interesting_riddles_with_answers12dbl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_681d98f446ca4c15aa8ce503ae7863c0.pdf?index=true
    • http://xinegubuxagod.rf.gd/dotisotiranul.pdf
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_024a9c55e7be4f15bf2703e098b47206.pdf?index=true
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_9307c9670f304e3395da6eba4b3e01bb.pdf?index=true
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_71537f92709f4601a2cb398b1c45d63b.pdf?index=true
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_a4ff0a0aee1d402bb929c8beef12a35c.pdf?index=true
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_7f3642c8362646f1a9696f18ac4af559.pdf?index=true
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_201d63e4df2048a08096ce3e0d8eab78.pdf?index=true
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_86b06e354a7e41188f55f54ff270b91a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d0.bin
198e6aa420e25378c8ff5ffae677895567a74c05b605148b191ea273865679bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 5272 bytes
font_01_sfnt_off000116c0.bin
c36b56c378d661105dc56e1b8cd58ea2bfc41ae6049cd86bb4baa39633478cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 11156 bytes
font_02_sfnt_off00013cb2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 4324 bytes

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