Malicious PDF — malware analysis report

Static analysis result for SHA-256 232009d359abeb44…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 04:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66d615fdefeab6828e967dcf8c025932 SHA-1: f81da259b6bab3f685988fc74a91111f6eadf3a1 SHA-256: 232009d359abeb44086c1ee331cd3799ea5195f9288d03180312c9a4c61ff1c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://medvor.ru/uplcv?utm_term=italian+made+simple+by+cristina+mazzoni+pdf PDF link annotation
    • https://beautydent.hu/editor_up/60055387581.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gowovofimadetoj.pdfIn PDF document text
    • https://cargobull.cz/res/file/pakepanudusanogironinewa.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/kivababiguxiparakito.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/97743351068.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/44805938444.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/kovadafuwozuxajidebigojul.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/xodiwubu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f49070dd---47037548410.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/duzuvotamumazakemunofap.pdfIn PDF document text
    • https://frisch.ro/files/file/fumefixisunivuxubobilitu.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/84807341503.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/monow.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210907211159.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/budupe.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/puwenofosulonokapi.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/fetajapewawego.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/71169902155.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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16984 bytes
SHA-256: 4448c942ec4b9fc151cdc98acf2535be30fb43be3c21ddb614d5c980a2287d97
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11048 bytes
SHA-256: 794c5738cd8d9545a5dce6cf971cbf18f79e6a7e67ea065b09cb3a076de3a41f

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