Malicious PDF — malware analysis report

Static analysis result for SHA-256 437daf48004e42fa…

MALICIOUS

PDF

74.0 KB Created: 2021-09-25 03:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7bfc5d61cb158e1b5be23de8dab83164 SHA-1: 5fc51152082f15710b2a98b457d041f310fe5372 SHA-256: 437daf48004e42face244fbd6488030e084d606fb18c6c60b820b21e73497b1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://euroambulans.pl/userfiles/file/51957078396.pdf In PDF document text
    • https://viettrungson.com/media/Files/5498757857.pdfIn PDF document text
    • http://klenderbio.com/upload/files/guporerajekujagedupumix.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/narokonidanokelij.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/zutada.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/67743144465.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7abf4260076682d7016ffaca7484fd8b/66270438893.pdfIn PDF document text
    • https://kapefashion.com/files/files/38542549160.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/70039395918.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/31024784261.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/xodivawegavixadagusudirit.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/22499235241.pdfIn PDF document text
    • http://195exim.com/datas/files/27819397339.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/76264668631.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/negenezugebokumi.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/89380303908.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kenarobe.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/ruropulivudepuvowuta.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ed7974f2871dae9b4265d21dbcb13824/77238755025.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/63627813498.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/83284851973.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/46515677771.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/22179121090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=india+after+gandhi+ebookPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/votilejarozewijakapu.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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 10604 bytes
SHA-256: 0da78965890c62cbe04972dbd29c66e8a7c845f75cb3c7d6adaadba881260cf6
font_01_sfnt_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 18424 bytes
SHA-256: 6668ccce21c5ddcd28ab5e33b9668f9158de56e97ab2b57a4190d65b829d39d9