Malicious PDF — malware analysis report

Static analysis result for SHA-256 342bd8dc0e80fad3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 22:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d7022170ad1e29b5de3f7b5795dc4075 SHA-1: fb34dc389e14d91db4edf8ee90fd21154925a5d2 SHA-256: 342bd8dc0e80fad3b372c949c711041507ec7d14da4e12602cdbc2b4c0d705a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The presence of numerous external URIs, many pointing to potentially compromised or disposable domains, indicates a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/75138990578.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/37939760063.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/26427822194.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/10643103082.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2612dd56c9309e07267e2f72475d1712/88231181991.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/27244485305.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/66962822560.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/83660505804.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/kukatexil.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/walatavisuzak.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/pabozilaxatenudunovofiza.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/vejuwivatodezusamezun.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/ligobosomoxus.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/35020787578.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/xowirapexanizimexarokato.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/tifuzebuxagunoz.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/63213492334.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/51481346855.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/22606342220.pdfIn PDF document text
    • http://waypl.pl/upload/File/kamufanozujawusekikodagem.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/33249917260.pdfIn PDF document text
    • http://e-sheremet.com/img/giboderilopumeka.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfd154277---pekuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=movie+and+tv+apps+for+androidPDF 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_off0000c413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 16308 bytes
SHA-256: 0bd0465c0c5d257babde1cf1591191174a245011aad75436c89b3c2b9204cc63
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 10504 bytes
SHA-256: 147a009fffb5b6ba764de00e749a98cc3131d2ed604c0dbf9e23cea13245532e
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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