Malicious PDF — malware analysis report

Static analysis result for SHA-256 756b3960feb6a830…

MALICIOUS

PDF

66.7 KB Created: 2021-09-25 19:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 14f102876ef0edc6f9b03adc4a59a5da SHA-1: 91165577c34c699c6d197d78e998e920670470ce SHA-256: 756b3960feb6a830d47ba6b39b2a5c5ad3309cec52b4a28ad2d7fc1c41ba1ecf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical of phishing attacks. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://box8websites.com/ckfinder/userfiles/files/16269795863.pdf In PDF document text
    • http://elitsatodorova.com/uploadfiles/file/56590238950.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/32864120400.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/60586044063.pdfIn PDF document text
    • http://iltorg.ru/upload/file/warugugaxuwinedagivuzut.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/75776449199.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e95aa33d60---bisidu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/goteberijix.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xipatigejupu.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/miwaxobi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191021063340.pdfIn PDF document text
    • https://luminex.pl/upload/file/19455439939.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4555125601.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23596049601.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/30243773402.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/41829889020.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/42412452844.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6gu2c6rf8663sdumq0nob5elj6/60459160289.pdfIn PDF document text
    • https://egf.tw/test2/images/file/62849349779.pdfIn PDF document text
    • https://aneri12.eu/res/file/2764175586.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/28607393778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pogaru+movie+full+movie+onlinePDF 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_off0000ab07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 14056 bytes
SHA-256: de4b726335aebba1eff12dfcdb874902eeaab9e51c039bd37f7128bdb03b94bf
font_02_sfnt_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 10456 bytes
SHA-256: fd6598560eaea231f422db653037d1b1b04dcb86a023d8a170f3d03cdb4297af

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