Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb7411313397fe0…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 19:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c69ede566eb0a762886065d4e9691bd3 SHA-1: 2173d78115d452038018171d217e509d4cea673d SHA-256: cbb7411313397fe0d5b88d6875909c0a0816603fdca6d3225cc369e94d3d21d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs points towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=the+punisher+comics+pdf PDF link annotation
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/63860264938.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/bimazarakito.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/54672640487.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/46205806136.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/32713021001.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/47128210962.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/49020911390.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/77933659455.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/28123029085.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/17ac1febf5d7455a36289647a946109b/17689610260.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210911060513.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff9c6a58f---sarusokudulepejupavuniz.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/datezowajelojujuda.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/tumagabapagasap.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/namanu.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/gokesamogurupotinepovabi.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/jibojijofedepukisarij.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/xefikonafewatabememesi.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/xanosawevodafapelilusol.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/samotoraki.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/givusawuwugoxowenazegegem.pdfIn PDF document text
    • http://prestopc.it/upload/file/falamalomukagosi.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_off0000ad73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD73 10644 bytes
SHA-256: 0ef650c8f7a8f6894532065cd586b220d7c868516d8b208716e8b81745cb3c7a
font_01_sfnt_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 16056 bytes
SHA-256: 46ac39b3cfd65b3d1dacc4982dcae892bd0d0edb3d9339d182a8dc3ca1a7c2c5
font_02_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1