Malicious PDF — malware analysis report

Static analysis result for SHA-256 106624abcbb4bb91…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 15:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5620a3986d38c584cf5b56692f0dd17f SHA-1: a52b2c73e75d365a178127a3b20dcbd00016ea9c SHA-256: 106624abcbb4bb91260bbe0068e71af5959825c74e39e046ca9672e36ed92e52
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the presence of embedded URIs and the link farm heuristic indicate a high likelihood of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://krisoc.ru/uplcv?utm_term=use+phone+as+web+camera PDF link annotation
    • http://holidayinntorino.com/userfiles/files/98552665802.pdfIn PDF document text
    • http://tdbm.vn/upload/files/bodobukurilenete.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1a4c3a8d---86523295636.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/wunuxefiwow.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/45674714766.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/8945928266.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/numutowozoxibobo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/08c89137ca26e0d276cb6885070482d6/kanemoxolu.pdfIn PDF document text
    • http://nensi.si/upload/file/jilowij.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/153195579.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/23764697397.pdfIn PDF document text
    • https://yuktogel.com/contents/files/sagixenivezofitiperamoni.pdfIn PDF document text
    • https://digireg.ru/upload/xejawisofaros.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/16806181268.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/50765527014.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/zemekasatije.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/gixujutawefogelorakusimul.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/numelojisad.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/xidofixura.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/nugabekixojadalivugobawu.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/mikumujafe.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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 10636 bytes
SHA-256: bb0b46da6de7a2a5c7bd1b2483219aa1393ce0d37deb764c9a7f5f4ee0257098
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 17644 bytes
SHA-256: 0532a95170596b9fdb4a8378253eee5cfbbcacb127f7aea5246ad3ba38a892db

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