Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9681c99e86fa636…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 12:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab16f75c98467e9279aecfbc61254b20 SHA-1: 2c4abed0d9f66c59e5ede8292b09a3116ff5826f SHA-256: d9681c99e86fa636fff537ed9ca5e6c4a6568de2acaf290d130465129af90772
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs pointing to potentially disposable domains suggest a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/19039680563.pdf In PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/pedawidosikifijejakol.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/64768730090.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/72974683827.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/7441876592.pdfIn PDF document text
    • https://hiroyoung.com/data/files/58761143151.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/9560421761.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/56093430497.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/guvelazijoxuralefoja.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jorafekubivadorefo.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/36144955582.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f798177607682e62ffe2111b45039656/310801002.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jeximatar.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/jovawas.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/77747827802.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/korodiridiponi.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/49174938463.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/buxoxima.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/78384621294.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tulijisiso.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/54241535739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hokko+life+androidPDF link annotation
    • http://irodori.kir.jp/files/file/73952492878.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_off0000b74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74D 10164 bytes
SHA-256: 8ceb84bdc396c1ea7b5c064be8559725784788165f20b6c9171fce3da08762e5
font_01_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16720 bytes
SHA-256: 6dfbfde67157854ebf0c6890cc76970eb3e7386a7deeab3a4b87e82e981c87ac

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