Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c11421eccdde9a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 13:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f176ddf3d73cf402bdd37085c923c1a0 SHA-1: d0bdd906058a8ab2cfa51611e0942e9b9cfbcc98 SHA-256: 46c11421eccdde9afa39e6fd8cfb69c11edf8085cc4c8478dab28ccef371a5a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://kimkhimientrung.com/uploads/image/files/23070613712.pdf In PDF document text
    • http://artgraf24.pl/userfiles/file/14226370316.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///2769677740.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/24028072783.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5d78d9f4b94dc10bf7405b7c78e3d4ca/99622544007.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/fututar.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/56853294034.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/44066463730.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/41953405056.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/tubukobedizujemawakelixa.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/64010479172.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wavamofuzelokibujunibilux.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/52848893330.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/88813970157.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/lopekaxokamamenuvakazoxo.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/dixof.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/suromakimuzifevezupoj.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/dujasubadajaxonetekef.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vigogubaw.pdfIn PDF document text
    • https://majubesar.com/contents/files/kesizizeg.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/lixevopel.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/kaliwoxanetodidekibosuzi.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/fotepimudoxuxuridux.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/fipapaluzisuzawovadukit.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/9442987465.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/sisutet.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/1387196570.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/mifitemibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+flash+on+android+phonePDF 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_off0000b63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 14532 bytes
SHA-256: 8da8c28d943a9d2dd6c40b5ea1bf1d57f555c3f3d28f7811617f86e2d1a2e07c
font_02_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 10772 bytes
SHA-256: 17823bb2bacdb6df2b6dda87d9b865cd5faa4af4dc41db1042d5187db6fab709