Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d2877e8fb1ba6f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 07:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 144a0c38c8ee912de19089eb82f442fb SHA-1: 94c36db15582f3f3bc0138be72e0142a2df78c2d SHA-256: 19d2877e8fb1ba6f730fde56c49ae3214f1ff3bdd34492b14025ab5bb777a750
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://huntic.ru/uplcv?utm_term=onedrive+sync+photos+android PDF link annotation
    • http://architettomontanino.eu/userfiles/files/kezatukafolowazuj.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/77219530355.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/16998565620.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/majudatidelifar.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/43842491628.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/77392344238.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090220504152.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/lefop.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/zogenajanozu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/58925557598.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/pefelefes.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/detoxolosovevewu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/setipanijexolufegu.pdfIn PDF document text
    • http://bresky.cz/res/file/85561250956.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/52908113343.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/befafikabevaw.pdfIn PDF document text
    • http://prompol.com/media/file/8916737415.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_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 10768 bytes
SHA-256: d913cccd18e99bfe68d0408bd4a8830d6cba3a822732cfd506187800419d2622
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 17356 bytes
SHA-256: 4294f75236c6cf309fdc4813e489fa253629bde0e3ec2711f4a62fea0f1a5dda

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