Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbce2f72f042e52…

MALICIOUS

PDF

91.6 KB Created: 2021-09-20 14:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9d59e7980cf7c4d96ac27e49be4bd62 SHA-1: a408e0f3ed61ed1b63b057f2678551ad2b2b5c82 SHA-256: fdbce2f72f042e5268025142ee87b8919d19f8d4244f0ba9b1605abecca0fe2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially malicious PDF files hosted on various domains. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://yibetter.com/data/files/68045146826.pdf In PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/27878842959.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142645122599---81072196679.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wonozazojibol.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/veloneteni.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/35256430051.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/74924025351.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/59391206688.pdfIn PDF document text
    • http://vce34.ru/attachments/file/zafuvegimus.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/soridikufopalixu.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/54332903234.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/timupotiwexi.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fitadubakawugidanagov.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/sizapodedakutabajusekuti.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/mopepetovudinefa.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sazol.pdfIn PDF document text
    • https://la-klamm.org/Files/files/36385594223.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/55668791095.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/86096437245.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/8265602193.pdfIn PDF document text
    • https://nexapos.com/upload/files/39687582121.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/58baa7590f9c8538e58e6b1d86060135/14599983236.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/20513434408.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/gerapeperowisexusa.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/56001039058.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60853447073.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nibekaverikalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=psychology+bsc+nursing+1st+year+book+pdfPDF 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_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 19448 bytes
SHA-256: 301a84d4a775901e5f00cb246a7d5440ef711b70144dd9271f09c47cdabd8cfd
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 11396 bytes
SHA-256: 7a1aaee8264e54fadc29d4f0e113ff914c8e813050bc5acec889e0826d010e37