Malicious PDF — malware analysis report

Static analysis result for SHA-256 830e71b780cb994a…

MALICIOUS

PDF

87.4 KB Created: 2021-05-03 20:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f78009ebb19f665d09eaa94e76395d44 SHA-1: a949a6d4ebe27277c5bcde95dd9921b7b3bd0c7c SHA-256: 830e71b780cb994a87c3d9da7f8abe319d2970c326a98fc7a496f13715b9204f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest this document is intended to redirect users to malicious sites.

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 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://bologen.ru/strik?utm_term=probability+and+stochastic+processes+3rd+edition+quiz+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490264/normal_5fd1fd43accd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_604e4c2c387da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_602f983e823f2.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/46510612624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_600d34530966f.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/nulitubuvukate.pdfIn PDF document text
    • https://wagetuve.weebly.com/uploads/1/3/5/3/135323282/lobatezapa.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/niburodevepepogik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_60493665e096a.pdfIn PDF document text
    • https://xodomifosipux.weebly.com/uploads/1/3/4/8/134865855/7825573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fd2efb41c51f.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/recetas_de_cocina_para_el_ayuno_de_daniel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_604fc63e24d0d.pdfIn PDF document text
    • http://giftcard-sale.store/love_story_books_to_read_online1odrg.pdfIn PDF document text
    • http://trixy-matrix.space/delonghi_capsule_ceramic_heater_1800w_reviewv9cq8.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/biniduvedosuzonolu.pdfIn PDF document text
    • http://itwomen.space/poulan_chainsaw_carb_diagram87ilw.pdfIn PDF document text
    • http://questotzvezd.space/how_to_draw_cartoon_cat_scarya796e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 5828 bytes
SHA-256: 9f66962c68d167abb9ddd153499d064df2e54e00beec5059830dd1b0e06f616d
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 12048 bytes
SHA-256: 72719d0d58f2831ee785374e74754000c4f82774b02b634f9474343bf1728dc5
font_02_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 16180 bytes
SHA-256: 0ff94441513b035e23d24d93fec609774dc2a353e3c63c656729570fb59db0dd

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