Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d36bc36f2b7347d…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 05:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f0801efb5fd638f1236cadb348d10343 SHA-1: cf0ae51571e0f7c80b3f110b583ec614bcc3d250 SHA-256: 8d36bc36f2b7347d331bd0ac099475d61a125f0945c297a58b65a53c3a66980a
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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.
  • 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://leonvi.ru/strik?utm_term=t-fal+p45007+clipso+stainless+steel+pressure+cooker PDF link annotation
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/pumimetolis.pdfIn PDF document text
    • https://pakidezosatujij.weebly.com/uploads/1/3/0/7/130775723/niguv.pdfIn PDF document text
    • https://sigibemora.weebly.com/uploads/1/3/3/9/133986782/sibaruguluvig_vikiz.pdfIn PDF document text
    • http://vinorama.fun/asana_pranayama_mudra_bandha_italianoynlxc.pdfIn PDF document text
    • http://aycotoro7.xyz/how_to_find_your_piriformis_musclemu91w.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/52c5a0d73.pdfIn PDF document text
    • https://zekubetude.weebly.com/uploads/1/3/0/7/130738740/megetojubidofaduxo.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/73034c.pdfIn PDF document text
    • http://magnetfix.store/jadupupelovilebugofej3v3tn.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/xigilariti.pdfIn PDF document text
    • http://lifegirls.site/62188626148ddyuk.pdfIn PDF document text
    • http://getporte.xyz/vagrant_story_weapon_guide01eqj.pdfIn PDF document text
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/c3c533e8d.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/povezatigezux.pdfIn PDF document text
    • http://znalomstvavip.site/sejuzi4aux0.pdfIn PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/ponatereremu.pdfIn PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/sader_mobifepabeburab_vojepazidimesex.pdfIn PDF document text
    • https://lukajupuxeburi.weebly.com/uploads/1/3/4/6/134630189/pasafikeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d71b50d-c0a1-47fe-ab44-e1893a381bb5/55148726015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca03b56-73e6-43ed-a555-557fb6667421/tagebajusutafus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81cab93-0448-43f8-bea8-ed26daeea320/jinujujagozokuxuviriro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb11bfe0-982e-4d43-840b-2d841d1e3081/pc_troubleshooting_guide.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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 5488 bytes
SHA-256: 8106b878b6223591a2008e19a61b8463863a7f20b515b88ef33e1ea55b9e99fd
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 10948 bytes
SHA-256: 04c153be5bba519bf312f4a173538c5a9c3f0b9f96fcc49ec378f2083bca1310

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