Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec14f1ebaf939c8b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 03:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38af763f661dc560c459542f9777ac44 SHA-1: 8ebc0209bbcde91b59e9df924ccd610344decfbe SHA-256: ec14f1ebaf939c8bd14a2322d3c5e87dfa46c0a6a2c26c059e9fb33cc035990c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. This suggests a phishing or malware distribution campaign where the document serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://isosklo.cz/uploads/xefegidowipi.pdf In PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/zojajotazagajos.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/13456111623.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/fevuwikefoxategasosoxakev.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/35872913566.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/60509056538.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161445a9a1ec12---tubefibonodup.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/39175738990.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/2053986815.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/25769889939.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/88473138962.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/mugobanusitaga.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/46694804069.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472be384726---32342143865.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/fobokoxit.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/lowewobefimi.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/sajemulinojine.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tilonelemuboviva.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/xegixori.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lulejeleg.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/xipetorafozok.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/sebolatosudilefanutave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=holy+blood+holy+grail+pdf+free+downloadPDF 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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 10844 bytes
SHA-256: 7933860adf5dfb0b86272564cdce05f6114b04c6a322b4d04631259086843f44
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 17192 bytes
SHA-256: adeafdbd92b96acfed380442aa348018bda439480295907fe8aa6f9ca4936eaf
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1