Malicious PDF — malware analysis report

Static analysis result for SHA-256 95eb6cc575dba807…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 15:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3781d4039da4852a094a048cfc100fb SHA-1: e678e9f657265915d0a9537af21bd6e62cd5854c SHA-256: 95eb6cc575dba807c15098326d78cc528d66831299a638648c552cb7eec2428e
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially suspicious domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF's purpose is to host a large number of links on disposable domains. No scripts were extracted, but the structure and embedded URLs point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sartor.ru/upload/files/gabawumasi.pdf
    • http://bjqyms.com/filespath/files/20210902020634.pdf
    • http://videocycling.info/files/file/bapawigebofiromitamuzom.pdf
    • https://mavachhaiphong.com/upload/files/livijiw.pdf
    • http://umrllc.com/userfiles/files/xitajuveburabubezites.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/26771312555.pdf
    • https://rajaketiga.com/contents/files/78474735124.pdf
    • http://asztalosweb.hu/userfiles/file/zubunepufafumapem.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/kares.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f8fc288d---likukov.pdf
    • https://ev-owners.jp/userfiles/files/71686203513.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lurubupeta.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac07c7bb6---67986224701.pdf
    • http://rmgoals.com/userfiles/files/pokuzujusatuzase.pdf
    • https://hobbypet.cz/files/file/4712800163.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/mukoreje.pdf
    • http://sparkpro.lv/content/file/lefogemulame.pdf
    • http://steakpluspizza.us/userfiles/file/12600512270.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/xizikuv.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16283099130.pdf
    • https://www.edm-medical.net/ckfinder/userfiles/files/rimaduxixobuno.pdf
    • http://odpadykj.cz/UserFiles/File/52842185721.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/pamanufadezigowate.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/gajonuzopewafotamaraf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=compress+mp4+to+mp3+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94c.bin
6358c3ff409fdc7a475ac7ad8a086e11be377a7fb2dfb341526824cd3d84963f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 17568 bytes
font_01_sfnt_off0001168c.bin
178fc490ad99f447214709b549c0a9c6c7452d1d4be3659d8b5682ca9cbc6a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 10532 bytes
font_02_sfnt_off00012e8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes

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