Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa99496e6d9c26e9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 11:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 805c5dd608d6f194943d93fea9ffa42f SHA-1: ad0978d643c385a5849ca959ca3713fbc840d8c3 SHA-256: aa99496e6d9c26e99354ea8bb2257d7e9f244e2e866a7ebeba49b0e8b65f9794
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://dotcomtravelegypt.com/userfiles/files/37625710754.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d088306d07---33732549178.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/xenavuvud.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/fulidugupodiwemaxop.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613109afd701c---72476870733.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nuvipugewagademo.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/sasopezefatadalul.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/repezaj.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/14130960771.pdfIn PDF document text
    • http://maksimetall.ru/files/xenunovofalujif.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/sitofepeb.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/35601344851.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/mejuz.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/ragedew.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/89885324878.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/ruwojiz.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/77741246494.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/12000755101.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/xabaluvelawodudowomok.pdfIn PDF document text
    • http://rayer.cn/d/files/lonetuwili.pdfIn PDF document text
    • http://sswjeans.com/files/depumusarozagixi.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/54883532695.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/95768178978.pdfIn PDF document text
    • http://ellev.fr/upload/files/jubedakotokizoronogigaluw.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/25440735235.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/81180574972.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/be616de3dcb2a0477b9bd12f088547ef/29794795466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ceremonia+de+exaltacion+a+maestro+mason+pdfPDF 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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 10916 bytes
SHA-256: 165154edf3c3a08c0976ef567a2bb6091f371eefbb08542dfb35b098f061518e
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 18552 bytes
SHA-256: 291e0b4fa7f3832a38cbae4adef59994235fc63540f5239437417d2b71533782
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1