Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7ab4392589de66…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 07:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8722bf207d80daacbd47f8e26644524c SHA-1: 14e66bf91cf66239d369c62ddd6587b66eef1c5e SHA-256: 3f7ab4392589de668246931f48e7105c1c246a409432f5facbb6a45e1eba1a7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to numerous external URLs, as evidenced by the PDF_URI and EMBEDDED_URL heuristics, which are typical for phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=android+emulator+for+windows+8 PDF link annotation
    • http://sh-songshi.com/admin/upimg/file///mopax.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/suruxukomaj.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/dobakofuza.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/vivosabasipaxanitopodosal.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/nurotiruvefuwixupekibima.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/24333445725.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/72043594980.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/joturulobepanafofita.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/81007422297.pdfIn PDF document text
    • http://leguido.net/files/38655375957.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/bazepotule.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/79551285879.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/34087482940.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/70319112136.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magugavadipil.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/sesawedasopoxudetis.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161454305631dd---wasalinagiveveji.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/67588625347.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/78317355966.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/11449614375.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/35136807071.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sopamomotaxofuboviwugiju.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fonejitoruj.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132908536469---20172315077.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_off0000c086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC086 10892 bytes
SHA-256: ef78741b4bc8411af19ca5fbe3b4a03065dfb033982d07a0d1b711cc2d95b354
font_01_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 17596 bytes
SHA-256: 1b00018c02a5e4e9bbffccdf66e71c480f271270ec0f7cc1b97da01b69f2e636