Malicious PDF — malware analysis report

Static analysis result for SHA-256 512bef94c8651008…

MALICIOUS

PDF

82.2 KB Created: 2021-10-05 18:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 271d232b1374e9e3cc69ec549c2f7bb7 SHA-1: b171aae3638a28620361a910d1ac44bde8a57308 SHA-256: 512bef94c8651008ad673444adcdcbbb1ef4853cc6494b4fa196e1f672302ea5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, indicates an attempt to redirect the user to a harmful site. The document body was unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://balaji-technology.com/userfiles/file/debutotisi.pdf In PDF document text
    • http://kzlo.pl/fotki/fotki/file/rijobiwazajaxubap.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/40340677514.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/sopenufugumarigowekexo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/80665560398.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/lipowewole.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/55227443590.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/9159550497.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kikejamawitonisenererog.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202110020452425746.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/tawekowalaketonusuresuge.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/39701918382.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e625b777e2a507c715f9f536ea3fae00/mesurajipedufapu.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/53908951383.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/9360574930.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/vejonepu.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/bopasaretufavavupivog.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/99309724068.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wogigofojunawajexasigipu.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/28492113937.pdfIn PDF document text
    • https://mklaassen.nl/images/file/wabetisakob.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403d6e9cad6---93126714740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+direction+should+bat+houses+facePDF link annotation
    • 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_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 10808 bytes
SHA-256: 970545eb5ad20df02811e3ecbf82406d693decd9eab45536957e90dc95dafdcf
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 19268 bytes
SHA-256: f93a351c595651bf8d3fe44e56e9334aeada2a43ab194882dbf2e4af691c650c
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1