Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8d3cfcd066d565…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 08:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33f8c6d8edc8ca9452badb1ec161722d SHA-1: 91442d05846abd0b4795366e36f8da819c4f139d SHA-256: cf8d3cfcd066d565be5c0c9e3c41ece165da464b901e3b2a4b7985ff2ae5dac6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 link farms, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=how+to+restore+data+from+reset+phone PDF link annotation
    • http://pallenberg-busreisen.de/uploads/files/xorajativ.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/762e4dcd6b296f4a78e99ce756b2dba1/duvolosozuwitemero.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/naxesuwirerewujikaparar.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kegomesikore.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/14769846425.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090515443470554.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/mosoberurimipagevolan.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gufef.pdfIn PDF document text
    • http://uteambio.com/upload/files/98079891769.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/julonetomakotazigorurade.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/2086126970.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/86811ac24855d8f326a8ba228458bf58/vumaxirefozeninopafobem.pdfIn PDF document text
    • http://electric-kernbichler.at/53685610294.pdfIn PDF document text
    • https://eternalbliss.net/file/pidukunoxiveniti.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/rulozori.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/nixewo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/92899000591.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/soboz.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/63588048279.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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 17348 bytes
SHA-256: adf4e6277effcfa0763ae3ef1ff0951d2fdf6cb988e3ba9422599207e07cc20c
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 10704 bytes
SHA-256: 83ce4b53ff1b9a3b7128c736fd79543bbada121a56c9cc01457342f6bc7205e8

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