Malicious PDF — malware analysis report

Static analysis result for SHA-256 a423a4f1270a17af…

MALICIOUS

PDF

68.7 KB Created: 2021-09-20 06:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e99ea6c76e295c5a92d2bf056566f9f5 SHA-1: 93f1110b3c49e52b2fd180886b1f210426b4585d SHA-256: a423a4f1270a17affd2bb186be0c82ce26385860d28f9a5f4b70b34ae70868c4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier also flagged it as malicious. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites or for SEO poisoning. The primary attack vector is likely spearphishing attachment, leading to the user opening this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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://saringkarnwood.com/UserFiles/file/66081206439.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/gimigubiwomadetum.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/saworapodunufodetub.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/roxurode.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/15383759563.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/lukaloxebov.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/40266588369.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210910023026.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/xamomoviporigeruroligonip.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/nivibexeridabezujarif.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/bubobemununuwubofikamuse.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210918035357.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/18376236355.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/sagitibi.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/ruzujevu.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/49256391517.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bofudugowu.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/rugeviboje.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kixegujag.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/93247819608.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0ed63f3d---xazor.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/76776175117.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/74289597694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cars+lightning+speed+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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 10676 bytes
SHA-256: c177cc7036085916a854b24ab5c699e871cd416952e5f991cbf6d9081a25955a
font_01_sfnt_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 14564 bytes
SHA-256: 80ad5659b0a8846699b25c589d4f2bdb255e046dc538110cbcf98841e72fe5b5
font_02_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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