Malicious PDF — malware analysis report

Static analysis result for SHA-256 1607c327b9ed9a05…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 22:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 086ddf2b5dd796fad174800b5c108150 SHA-1: 2868a3c666fd27b532a1f97499b0972804918706 SHA-256: 1607c327b9ed9a05f099920f45aafbfd4b5ff2f47a83a1ee4e93fea9c88eb5f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The primary URL points to a PDF hosted on yjccnc.com, suggesting a distribution point for further malicious content or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://yjccnc.com/upload/files/guzafofewewenikobisowam.pdf In PDF document text
    • http://agierresrl.it/userfiles/files/jalisaladoxilewazugi.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/litobexizemelokirud.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd646b6313---21757966031.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/rawuvamewemosobav.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/sagosutaletepafo.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/ragedex.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/nimavazelukowipo.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/90146592488.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e72bd8322---jalijajubonez.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/76514790177.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/87729702715.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/memakujasulusotebamepinem.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/tatopufasunup.pdfIn PDF document text
    • https://thehouseproduction.net/file/zaguwovuzojigidananefo.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/zapigisanige.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/gagusatados.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/7930312256.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/83450894156.pdfIn PDF document text
    • https://quizai.com/uploads/files/99696358637.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/ponabividawapeginipe.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210901232526.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/39819757055.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/gomarorivinuvutuno.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/tukumalutodademujasu.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/91085003778.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/2567443947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beats+audio+live+wallpaper+apkPDF 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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 17188 bytes
SHA-256: 7bf5a22517a6181957252a3daddd0a6cf8bd03861e2eb6bef2c9318a9169cae7
font_02_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10676 bytes
SHA-256: 62c39f3ef9f1b14d3be3d3a4dc636bad14f97577ff29382d656dc24e2e0dbedc