Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2af208069e6edab…

MALICIOUS

PDF

74.7 KB Created: 2021-09-28 16:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9db5933377c564f8e188a362da761bbb SHA-1: 55bebb1590e45e4dbde42afe0c438e9f57dcf9ae SHA-256: a2af208069e6edab6d117cd87049d2fddfdbfcb7c8fc88db10330acfe2edb943
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to distinct domains, many of which are likely disposable. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ottomaniantextile.com/userfiles/file/90073815606.pdf In PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/rojojeberenatogunudi.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/kurotibofavaxibutinawerep.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/25181986697.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/golurirarike.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132861aebd31---fopadi.pdfIn PDF document text
    • http://vinmexindia.com/uploads/xezebuzemid.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/68088764628.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/33245014820.pdfIn PDF document text
    • https://tierlistei.ch/downloads/33362480711.pdfIn PDF document text
    • http://didopack.com/files/fujuviro.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/xemovafoji.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/40092874093.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/9867114025.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/sovexo.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/ribozawatagaguf.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/21085586528.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210914110156162.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/79774654168.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210911160751.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/larapozeluburupusejozo.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wazoladetafamofusibewav.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/50113262490.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161361716bd7b3---renod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=supernatural+season+3+123moviesPDF 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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 10996 bytes
SHA-256: 47549e744093b925a418317fb3c6dfd5cba726136ef94e78bc9d4ef1aa06c733
font_01_sfnt_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 18716 bytes
SHA-256: 80be49c2ff659f41678bb998f8318e893e472e1b3aa94cf8de6db8c88b1f7150
font_02_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1