Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc12a6829a6504…

MALICIOUS

PDF

76.3 KB Created: 2021-03-13 21:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 641a9351479a7100b5aa7137088050c6 SHA-1: dc54f79ca3f6f218aa699607365cf99319a271ca SHA-256: 78bc12a6829a65042c0ea7173cae1ffa833174cb86ee4a4f61704b20f652d9e2
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and are structured as link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5485

Heuristics 4

  • 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 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
  • 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://resalured.ru/award?keyword=mpsc+marathi+books+free+download+pdf PDF link annotation
    • https://nemusadepupozug.weebly.com/uploads/1/3/1/4/131453027/vatavitos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_6027873378612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fd1648f1fd3c.pdfIn PDF document text
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/5779630.pdfIn PDF document text
    • http://it50disconto.info/que_son_los_antibioticosthzig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5fcb75ebc5e50.pdfIn PDF document text
    • http://badamow.iblogger.org/sales_skills_training.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/nujez.pdfIn PDF document text
    • http://relejovavup.22web.org/lomefaxevawujamu.pdfIn PDF document text
    • http://kkkirrreeee.space/hannah_arendt_la_banalit_del_male_film_streamingea16s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_5fe939d90532b.pdfIn PDF document text
    • http://albatros-trans.ru/294246960854xkyz.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/5591861.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/lekexi-wiruzeje-kagivuvewami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipidexoludo.epizy.com/93603439284.pdfIn PDF document text
    • http://xetojawik.epizy.com/37414612206.pdfIn PDF document text
    • http://zazisuj.epizy.com/python_for_macbook.pdfIn PDF document text
    • http://jobisazukom.rf.gd/administracion_publica_en_el_peru.pdfIn PDF document text
    • http://borinalujid.epizy.com/45663068708.pdfIn PDF document text
    • http://lewupidofiji.epizy.com/75145290630.pdfIn PDF document text
    • http://fetapewifug.epizy.com/comedy_movies_bollywood_2017.pdfIn PDF document text
    • http://supikatiwo.rf.gd/casio_fx_991es_plus_tricks.pdfIn PDF document text
    • http://lujemibezigan.epizy.com/is_outlander_on_netflix_the_same_as_starz.pdfIn PDF document text
    • http://losotejusegiso.rf.gd/jezufejazizuworoxigibup.pdfIn 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_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 5484 bytes
SHA-256: 098ce1ad407c751b3bf4eb0a13354411440d4ed53b9779f74cc482badfec9e65
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 11036 bytes
SHA-256: 601969df1ce46fc7eb7ee4148fd93087d9f0a9a68d310c067b8b974ecdc5f1f4

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