Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d0a8b72f294e61…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 01:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e0b28814987e70fec2524f0301bb2c SHA-1: 1196f26914a9591fb7a080f38aadfac93d1bd2e1 SHA-256: d4d0a8b72f294e614f911d3fd4c3fa638b2a3ebf932730550bc2b65c60ac96d1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pelibifir.ru/123?utm_term=harry+potter+glasses+and+scar+template
    • http://rigizaba.iblogger.org/pubg_cosplay_guide.pdf
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/51b433fbda16.pdf
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/e5e84252ba6a.pdf
    • https://cdn-cms.f-static.net/uploads/4480387/normal_600d4cffae881.pdf
    • http://vupofapotonez.22web.org/will_warcraft_3_reforged_be_fixed.pdf
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/megoweke.pdf
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5fec950721584.pdf
    • http://nepufazikeki.iblogger.org/engineering_drawing_tools_list.pdf
    • https://cdn.sqhk.co/tefaxobaf/fji2Z6Y/piano_games_mini_music_instrument_rhythm_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ff9d33dceced.pdf
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/3761659.pdf
    • http://nugidaga.22web.org/biwudesuxinetok.pdf
    • http://lelekelosutov.getenjoyment.net/linksys_router_ea4500_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_6019ff168bdfe.pdf
    • https://cdn.sqhk.co/vigibizez/IiDwggM/nuguzesop.pdf
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fc7f1116a6e3.pdf
    • http://xuzobinemipivor.mygamesonline.org/how_to_use_bitcoin_atm_video.pdf
    • https://cdn.sqhk.co/bisuligiga/iiI4UJp/furniture_mod_minecraft_1._16._3_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nifopufu.epizy.com/65739796476.pdf
    • http://bajekixizosi.myartsonline.com/mupexolemikivifu.pdf
    • http://sejekowosabukog.epizy.com/pronouns_worksheet_with_answers_for_class_7.pdf
    • http://mawekipabotore.epizy.com/86733824810.pdf
    • http://gixarewujedel.atwebpages.com/46055368526.pdf
    • http://kalujagemivinid.epizy.com/gasket_sheet_2mm.pdf
    • http://sudimomovaw.epizy.com/13357465186.pdf
    • http://tukakuze.epizy.com/20506818163.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07a.bin
8889d7952f1eb2f1fd7f103a12284228045b41a596aac708463588b764c6558d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 5456 bytes
font_01_sfnt_off00010301.bin
deeda3425772e8f70af3d64b0230a7d08344bfad2985f71f525ce801d4cbd789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 11440 bytes

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