Malicious PDF — malware analysis report

Static analysis result for SHA-256 744a4880b022df1f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 17:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4d0893e71deecdefdc7cdbb81c736f0 SHA-1: de9586b7ff6deec607d60e32702320eb74f24eb6 SHA-256: 744a4880b022df1f67f2f0782846cbd67e1d7ed618dc945136d2510220e9075d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cgpreceptor.com/ckfinder/userfiles/files/38441921781.pdf In PDF document text
    • http://nazycakes.com/userfiles/file/pobodisomen.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xudavafajelesom.pdfIn PDF document text
    • http://itena.si/uporabnik/file/danil.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/rabazijaliwusuxikuxajorid.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/mikozedijilaziwu.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/69868326508.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/89039582711.pdfIn PDF document text
    • https://geloracinta.com/contents/files/24639637004.pdfIn PDF document text
    • http://steinemann-ag.ru/rovuwefewuramifup.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/29874048207.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/42494118620.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/86241584239.pdfIn PDF document text
    • http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/vawanowel.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/64135104343.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109030446534679.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109090756535620.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/40358833725.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/wovexo.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/19185030632.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/8436597653.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/de99e203414d48f81be140f563a6a18e/bomijifijimujomuwozapovi.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/36471812252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+egglocke+download+gba+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_off0000c0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 10764 bytes
SHA-256: ca34b8124fbe7f344e49eaa4f1aaefa5304d63971f686201771a259a11ad0dc7
font_02_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 17720 bytes
SHA-256: 152090973ee5c05de30cc50fd934e7b1040803cebd39dfa4cbde04cf25f5a4f0

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