Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f011265d86c204f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 18:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b33e2a366f60d9011af162134e9f4e50 SHA-1: bf7c73e82ac6e9a8f9b7aa27607cbabb26d88a13 SHA-256: 9f011265d86c204f626a653c87aacc58dc19bf9d0215be1273882ab3b3865674
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+to+download+apk+on+computer PDF link annotation
    • http://skalamatbaa.com/userfiles/file/bedabetafosaba.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/56743008096.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xusodozesepura.pdfIn PDF document text
    • http://gibisch.info/files/files/tabubixunavujivunadeser.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/mufilibesaripokumaxo.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/8488598838.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/51728449855.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/43385478536.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/64513910963.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/liruzodokimipasutak.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/56523113271.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/89842837052.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/37406622422.pdfIn PDF document text
    • http://clingac.com/d/files/vinofutibadefe.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/nanob.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gutezudunusapodefud.pdfIn PDF document text
    • http://partnercable.hu/files/951519226.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144be5ca62fc---tefixog.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210922_78570836EEB2F3C6.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/vofugasanotamuxuzena.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d24867c103b21da4e6b770fc8e6f29f/kikat.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/46857067798.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/tilasanelepuj.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210921062912.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210916_BF82C08C73934479.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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10684 bytes
SHA-256: e91cd482378baac44363f9b280dfbf6a688e6546fb6993b73d11856e48baf6ab
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 18524 bytes
SHA-256: 8a057b7c2afacbabc6225cb5d55b9fa252d49ce69d5bea5a0c9f07ab169a513c

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