Malicious PDF — malware analysis report

Static analysis result for SHA-256 816d02884db8ca75…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 04:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 159cbf0cbc301fcf586debac1b2ced79 SHA-1: 491a95fa7fd10cf3a9dd01cd73fe9c81da76b7dd SHA-256: 816d02884db8ca752eba4b391189fc82634c316e8c9e51068142583e6936f219
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=iphone+camera+app+for+android+download PDF link annotation
    • http://bahtiyardishekimi.com/fckfiles/file/jirakifume.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/lakifubitazepesiwogefo.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/memorupogavar.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/xufemapewa.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/hfj5bp900bqppcjusl9fg9agb8/femuvogitijonejeb.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xezuso.pdfIn PDF document text
    • http://kidneystonetreatment.in/userfiles/files/11898794710.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zezonegasozi.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210915150452.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/fakoluxikedimixabato.pdfIn PDF document text
    • http://biosite.ru/images/news/file/genezixunofanatifap.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/78078898272.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/52710597333.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/21090407242463856161ro9.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pajapusikaraviwo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d1b9522cc2fb3ba858ef8bf36d02797d/gowofevimu.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/83118931361.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bagutaxofenejazagu.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/71863987935.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210902_50A304B3704C739B.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/jepewisepepun.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/fulimozadezo.pdfIn PDF document text
    • https://85097781.com/upload/files/94751554419.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/2998417286.pdfIn PDF document text
    • https://priscar.com/documents/files/wukutefedanasusu.pdfIn PDF document text
    • http://mobil-tech.com/files/12069688504.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://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_off0000bd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9A 10656 bytes
SHA-256: ed8121eca2bef6cb7792a99710b57d419cdf452a0ed1a6e5b517b932c77f75fe
font_01_sfnt_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 16604 bytes
SHA-256: 73f23b104e73bd64ba59274a9ea58d5d26c88cfc169c43f1df7f6d20afc3aae3
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1