Malicious PDF — malware analysis report

Static analysis result for SHA-256 0735ee6a6af02a62…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 10:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96384b26a8845b702d90008549b71069 SHA-1: 202302af65124dac4c8d80ed714dc282060acc61 SHA-256: 0735ee6a6af02a62956d2561645ab7891eed8830e6d6723c221aa288037dc9a5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users. It contains numerous external URIs, including one pointing to 'inwebjor.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an intent to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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 https://inwebjor.ru/uplcv?utm_term=convert+movie+for+android+phone PDF link annotation
    • http://sfalojistik.com/userfiles/file/gaxapuvugef.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/muwakojadarotela.pdfIn PDF document text
    • http://alkanboya.com/files/file///vujemisaxelapibaderu.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/82967898200.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/gibom.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/bevozinorezusugom.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/90673796124.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/bibuxibasomewaxuwizavepu.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/10757766064.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161384e6c8ca89---jesunamewuremisutogu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90bbbe96---87613956718.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/39187707389.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/19200101505.pdfIn PDF document text
    • https://novsport.com/content/File/xabojegirejineru.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/60560367139.pdfIn PDF document text
    • http://blccy.com/userfiles/files/97316838323.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/jetejetuvo.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/juwazukux.pdfIn PDF document text
    • https://fobh.net/userfiles/files/jigerupidigevolumeg.pdfIn PDF document text
    • http://guowangcable.com/d/files/dakoxumajabonanepezunodo.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gilonagimodowevixase.pdfIn PDF document text
    • http://annabarons.com/files/files/26185692102.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/kokudofikax.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-12/20210912122851815674.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/xidokixe.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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 13736 bytes
SHA-256: f8faa3cfc8e15254969abc282400b6072bb21d6337af4128a0c4c88bbbfa7425
font_01_sfnt_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 10648 bytes
SHA-256: a0ada6d2764dddc20c816a786db34e21dcf625220ee337841292ab4bc345360e
font_02_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1