Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa0b3513707f08e…

MALICIOUS

PDF

67.1 KB Created: 2021-09-26 12:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75dd562145808261d17b9961b018018e SHA-1: b25bd76efbaba4b7707ae2598c750af49457c8c8 SHA-256: efa0b3513707f08e93b2f5a580e1e59e9747b3727c9fcc169531f43ec197f26e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document with an action trigger, typical of a phishing lure. It contains numerous external URIs, many hosted on potentially disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://ajarnveerapong.com/UserFiles/file/wenasatupejin.pdf In PDF document text
    • http://superfasttv.com/uploads/files/gabawe.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/82811612219.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/deguragel.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/11825888628.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/26902854445.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/50422474758.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/16836386002.pdfIn PDF document text
    • https://funke.be/data/file/52621688873.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/71953835249.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/vagujipoderuriwej.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/nomimisoturorujikuwigusi.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/99344698179.pdfIn PDF document text
    • https://2acontractor.it/images/file/sewunutoduk.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/bikoletenoja.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145e69503a4b---99009265126.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/gawal.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/zozurivoxe.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jugawofapodoxefoka.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/10911155780.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/fitebobezajunosar.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/sulesajokorofudikew.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i196e76fpua1lc8bovvlqkkb73/gexuxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ice+cream+game+for+2PDF 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_off0000ad63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 10244 bytes
SHA-256: 9689c4f6311f0ede04fa523cda4f3c1349734ab125be8c7100fbe2a7a781ed85
font_01_sfnt_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 14044 bytes
SHA-256: 2ad69f55fceaae940118f8dd2db9a5b37590c95b159fa693b442bda85026c588
font_02_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1