Malicious PDF — malware analysis report

Static analysis result for SHA-256 472892d75e699b95…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 08:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8fb08923cb12b168799344bc17a6dd74 SHA-1: c7b9b99050428e2e2e006930b4ca861b52fabad3 SHA-256: 472892d75e699b9583ebdd2fe1013a6ca4b6fa2d2d8c8cbf76f2df5ebc240f87
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, one of which is algorithmically generated and points to a suspicious PDF file, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external resources, likely for downloading further payloads or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://marcuspietrek.de/MARCUS/files/file/mimukibazebuv.pdf In PDF document text
    • http://www.europesolidaire.eu/userfiles/files/laberenipenabipibosuvedaw.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/tironirugezeriji.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/penumupajubokuwot.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/zamagikigivuxa.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piralixomakot.pdfIn PDF document text
    • http://apsons.eu/files/file/23027399620.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132982f04243---52039494846.pdfIn PDF document text
    • http://mq-water.net/upload/gurovixufoki.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4bddc09e---36669706520.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/16355770969.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sarupa.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/jokosofewakitatiteka.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210913101327.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/24578572605.pdfIn PDF document text
    • http://quinta.cl/upload/files/xarerunepono.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/judinosumejigazilejizuzej.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/78292796306.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/vodusanox.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gudenobosudoxumegudenixuv.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/nizawozawulije.pdfIn PDF document text
    • http://hongdacable.com/d/files/ludikema.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/89416094596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pubg+lite+download+apk+freePDF 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_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 10924 bytes
SHA-256: ab031f1704e9114270c7da5bf0748f5607fd0ebef59230fed68504277c964712
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 17804 bytes
SHA-256: 6cbb9fd4b7a3172ca03f8b3ccec2e1194e7c14bb5bcbd7c5087bbacc435a02be
font_02_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1