Malicious PDF — malware analysis report

Static analysis result for SHA-256 20adba8c682949d9…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 11:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a4abff260d090f8bc6eb49d71212579 SHA-1: 1d6f33d95dd8e84c8adae8d7410bf08d8aac7052 SHA-256: 20adba8c682949d9caf2352db3fa4b76c6025c218b9d24770018c23033c4014e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable, domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://logisticsnetworks.net/ckfinder/userfiles/files/96715055861.pdf In PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/25326090441.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/69745511325.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/panobemixekarekujuso.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/87887956855.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091414292980554.pdfIn PDF document text
    • http://clingac.es/d/files/botedomavanamud.pdfIn PDF document text
    • https://ibericadearmerias.com/file/489389274.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nozina.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/xuwatakori.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/jolifupimuzusepesineza.pdfIn PDF document text
    • https://yodobashi-church.com/zajifutixedi.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/13008412817.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/ditogodor.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/virizolifolomalo.pdfIn PDF document text
    • https://conrays.ru/f/data/71364909885.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910155010.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vovamidinudufedadivafuje.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/rutomakexodowinawumuze.pdfIn PDF document text
    • https://podimercrm.com/img/files/nixokazaxatawuvigup.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/49627843982.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/78977355748.pdfIn PDF document text
    • http://sergeybazarov.ru/file/barewebobebasawiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+head+voice+and+falsettoPDF 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_off0000ae03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 10864 bytes
SHA-256: 6fdc9a2e38a44234152d2d43ea5a6598c40f9f1bd9f678dfd1c244d98f76a5ea
font_02_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 15100 bytes
SHA-256: d8b53c814d3e658ee50bde7758cf2a069e5c2eac96cb5c74192f4dcd4ecdc15e

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