Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d4d533b6691d80…

MALICIOUS

PDF

97.6 KB Created: 2021-09-14 03:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac4455bdf667577f1ccefd8cdfa53d14 SHA-1: 03ffd47473d88d137e65d7aa5093d0df956dea1d SHA-256: d6d4d533b6691d80b8ec829c28fe2a85cb5c26c2e9c05c6e7621f7c544602e89
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://crewmak.ru/uplcv?utm_term=watch+venom+streaming PDF link annotation
    • http://idealhca.com/admin/images/file/fuvija.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/xetemafun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927a7855d8---53634821614.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/89763261698.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36928878578.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/42255343996.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fuwepulobesinilalox.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/38228407174.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/10210381710.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xuxun.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/3902151147.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/nerikaxovux.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210906_818875BFFDA3E3F7.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/78377543148.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/13233596296.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/25660089220.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/gitemu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/89870901338.pdfIn PDF document text
    • http://unityproductions.com/upload/files/xegitosuzaxazab.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/zoxalamebateru.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/gopobosetejox.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/nirejevevikanolula.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/56620708237.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907033136.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/babejup.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fipido.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/50250133481.pdfIn PDF document text
    • 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_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 10692 bytes
SHA-256: e4b4bac5751742f564d68119c3a81a2fad456c6ab67ae6bc28f7461c6aaeb0c2
font_01_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 18584 bytes
SHA-256: b69c3a2dc718d9909de0cfd05d9cbcd6508569742487d193d948cc516c8f43ab
font_02_sfnt_off000160b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1