Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9172d918831bc5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-29 10:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea4cb99fd0aa5853382187673401040c SHA-1: dc57ca1c3580bfaa048c8d672459fd4ffc48cbdb SHA-256: bf9172d918831bc5f030661b4a688d2c7ad699c529089148175fa4f86b7b1d59
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to potentially malicious domains, suggests an attempt to lure users to phishing or malware-hosting sites. The PDF structure also indicates it's acting as a link farm, further supporting a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emenu.hu/editor_up/soxukefugovuzaf.pdf In PDF document text
    • http://myphammonly.com/luutru/files/kalesomevuvimuzot.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/9945298043.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/54348079226.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/64400778410.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/45642530515.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/pabavusowiwanawusuwop.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/28588292703.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/92107061176.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://delta-serwis.pl/pliki/75050295810.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/letuxeligemurad.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310997708b4---kezibofojufefomanuse.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/36059030785.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/39225648163.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/30545520500.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/zomikinidufedo.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/17305908390.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/puvolokaxi.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/58769323352.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/sorewunilax.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202194225133307.pdfIn PDF document text
    • http://skupka54.ru/upload/m/81889908267.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/mifolunovodunatur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bollywood+movies+online+streaming+sitesPDF 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_off0000b634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 17560 bytes
SHA-256: e878e01c7b22bfb5ebed11bb1a3b7cb7571ae2f8311c43a477724b3c4b5f3608
font_02_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 10912 bytes
SHA-256: 5c96f42ed14eed5b52c6f5b98f9c3aa47f11617c677a5ff8ce1443356aa66deb

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