Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bae3cc5da797c8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 04:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bb2205cfa88b356bbca9b0d4c8040d6 SHA-1: 2c388b84926b0bc8e8e215a09d26aabae06288ee SHA-256: a2bae3cc5da797c8a039f3faddfa157acd0cb2166f60b60e1a60a502b6eccedb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://psystat.net/candyticket/uploads/page_images/files/63465822679.pdf In PDF document text
    • http://www.benyowsky.com/resources/files/21139329760.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/gezozifirezijonutewefarit.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/42705014167.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/33979549304.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/49915964650.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141c92838878---xudipivijijenodapumefuwi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/86721852310.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/jobojufopamokazo.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/vobadanotis.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/gezolebabeze.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/19816109303.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/gubipomidesexasukepug.pdfIn PDF document text
    • http://aprt1day.ru/file/54817481053.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109180007334237.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091701284253.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/19663084450.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/gekowibelaki.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/lafurez.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vujaleruxem.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/82999109953.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/bosaremogovupalomofapupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=boxing+diet+plan+for+beginners+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210907/16309843781178.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_off0000bff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 17016 bytes
SHA-256: 2fbdb4eb58e3f2dc96209c1bffe168075cbc7c97e202e7c93f9a47d3dcb6eea4
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10968 bytes
SHA-256: 5b7e29c09ae5f9c300125ab770651e56a6601465a83df024a0968c0c424deb35

Open this report in the interactive analyzer, or submit your own file for analysis.