Malicious PDF — malware analysis report

Static analysis result for SHA-256 0287d05e5043137e…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 22:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 038cc4f6c855d0f038f97e06f3a86fe0 SHA-1: 6f36f095bd21bee65140f6262e6c758983dc35b8 SHA-256: 0287d05e5043137e2f57595e2d1b96c70e972e0351f2d956b400c992a202fdb8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=what%20does%20the%20mandate%20of%20heaven%20mean PDF link annotation
    • http://vykupavto54.ru/24353805055fl72y.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/HheWgih/dehradun_defence_academy_fees.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/6b41c43a9061514.pdfIn PDF document text
    • http://lenudes.com/vaaste_video_song_dhvanigt47a.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/thcT6hb/infinite_growth_game_wiki.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/4744380806888k1o.pdfIn PDF document text
    • http://rimka.xyz/c_initialize_static_member_of_template_classegti4.pdfIn PDF document text
    • http://leadtop.co/97784733834h1u7i.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/K3Nuge2/76247443824.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/3319396.pdfIn PDF document text
    • http://kismykeitio.best/billu_bar_bar_full_movie3emfc.pdfIn PDF document text
    • http://meinekarten.best/sonny_liston_song3mxwv.pdfIn PDF document text
    • http://ezfix.asia/264960721256qenq.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/Ighq9dK/376933038.pdfIn PDF document text
    • http://moitender.org/kexoxelaxivunuvilqega.pdfIn PDF document text
    • http://kellys.space/zavozusobajatefipirukotisrgzp.pdfIn PDF document text
    • http://homiak.fun/66678274601ez871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakepusejedub.epizy.com/microsoft_publisher_cookbook_template_free.pdfIn PDF document text
    • http://marobow.epizy.com/betusile_mcinga_song_vuso_wakho.pdfIn PDF document text
    • http://dujepuxa.rf.gd/how_to_delete_accu-chek_nano_memory.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 5092 bytes
SHA-256: 8721f699311e5e0f9d2b634ceb3197d5fc3512dd544fe49e4d8153952128bb70
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 11024 bytes
SHA-256: de00ea93c81b78a85a0ca47eb445012e76451061d11006636c659e9611f9adfe

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