Malicious PDF — malware analysis report

Static analysis result for SHA-256 b857ba178de787bd…

MALICIOUS

PDF

84.6 KB Created: 2021-03-25 06:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 87b6eb07c5f4018057de99404a63a736 SHA-1: 24b3d72c5d8b428c98a2eaa177c30b37acfe918b SHA-256: b857ba178de787bdb9ebe74d265357c133be47a9efb035096225a804a575114d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://fokemale.ru/strik?utm_term=damasio+descartes+error PDF link annotation
    • http://basiditdcf.space/vabof7uupz.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/iN1ieFE/titamekiterimob.pdfIn PDF document text
    • http://velesvoyage.ru/functionalism_william_james7tfjo.pdfIn PDF document text
    • http://robolab.one/405888857218lh8l.pdfIn PDF document text
    • http://autoport76.online/tuzalevunoxepejoxliiqp.pdfIn PDF document text
    • https://cdn.sqhk.co/tafoxenolagi/g3iadKc/csr8635_bluetooth_datasheet.pdfIn PDF document text
    • http://tiktokhd.design/bhagavad_gita_quotes_in_tamil_with_meaningaizln.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/bgjihIA/hungry_shark_world_all_map_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/5gd6jbh/39314784588.pdfIn PDF document text
    • http://luminar2-download.xyz/mn_dmv_road_test_appointmentwga85.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/hvjaiav/tesiximonupanape.pdfIn PDF document text
    • http://vurenosul.22web.org/brands_hatch_performance_ebay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelofobomafagez.epizy.com/12092476204.pdfIn PDF document text
    • http://vekamujibatebig.rf.gd/catarina_and_the_others_film.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/filejoba.pdfIn PDF document text
    • http://fetufebutegiv.rf.gd/aesthetic_instagram_story_background_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/vozitixotojoxesomato.pdfIn PDF document text
    • http://tebuwibuweni.rf.gd/realidades_capitulo_1b-_5_answers.pdfIn PDF document text
    • http://vopuxoke.epizy.com/watukuvojalawubonetul.pdfIn PDF document text
    • http://sivetidezu.epizy.com/los_juegos_del_hambre_1_actores.pdfIn PDF document text
    • http://neveket.epizy.com/asian_tv_series_sites.pdfIn PDF document text
    • http://dakiwadizadenig.rf.gd/6617425425.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_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 5052 bytes
SHA-256: 073144fec3d711998d0594307adfb2f2d1c3b8cb96c2d0d53b7d19c7a5f566c4
font_01_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 10436 bytes
SHA-256: 9703b5c5032a61288a9335eafc06b87783382df8da854340c54c2106d8e0a319

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