Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bec09460639984…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 21:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07f83b494acdf9960f81ae9facba897b SHA-1: 9891514b03448566f7a8529f67a78d886025aeac SHA-256: 55bec09460639984b7e3bd8de690aaef97b966bf21b6924d41a15b0d9430b447
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=microsoft+publisher+viewer+for+android
    • https://dildendilecevirievi.com/upload/ckfinder/files/38591181672.pdf
    • http://thermogroup.ru/uploads/files/fadaruzelifobeja.pdf
    • https://adikkeempat.com/contents/files/xabem.pdf
    • http://tiendanatacion.com/noticias/files/rukivajodugev.pdf
    • https://sanmuabancongty.vn/images/content/files/57421743476.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404bcf662b0---60734274159.pdf
    • http://kaus21.com/userData/board/file/95918374319.pdf
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/47516851691.pdf
    • https://rakowka.pl/userfiles/file/wozonuli.pdf
    • http://almar-bus.pl/userfiles/file/bumabutunodovatenukubi.pdf
    • http://amirafouad.com/uploaded_files/file/5067756560.pdf
    • https://xcheck.vn/uploads/userfiles/file/71361655910.pdf
    • http://tuanayapim.com/rsm/files/28368896548.pdf
    • http://vietsaovang.com/uploads/userfiles/file/fudomujasetatobilowoxa.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdf
    • https://istocdukkan.com/userfiles/files/wukomalonaxavasisebuba.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f25b0043e0dcdb91b34c2a1471fcfff1/fesozurege.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/32379925784.pdf
    • http://purofirstli.com/userfiles/files/rajosof.pdf
    • http://abwingsmd.com/uploads/files/28521199512.pdf
    • http://peoplefoster.com/pliki/ragoxopo.pdf
    • https://bold-iot.com/uploads/files/202109020558241461.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c845.bin
bda66f7a89f00d3727dc43be50e26c34dd75cb16f2851b23d7393e495bd176f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 17396 bytes
font_01_sfnt_off0000f527.bin
ca807cdb3fd98b8e6b7ca00c99c993410aaec78e910defc7a97a56b009a9400f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 11100 bytes
font_02_sfnt_off00010ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes

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