Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3fca7c7866ab67…

MALICIOUS

PDF

69.5 KB Created: 2021-09-09 19:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3da894158de4477b2e55de73e027a769 SHA-1: d6f56c6aa6d125999ff43a837653512d79c333a8 SHA-256: ef3fca7c7866ab6782ebb7ee44e72b1729f5153b49dbcb1e4379ad37d0452706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://bsp-oblspl.org/ckfinder/userfiles/files/garadebajija.pdf In PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/burikorasavizosag.pdfIn PDF document text
    • http://canvangdientu.com/images/file/xobidenete.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/77122434858.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowodivoverep.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jojepitimorelajinigeduno.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/63884092313.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/volozisitoxoza.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/xugajiloguniwabesidixige.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jinodaka.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/bujeroranagativikoditulun.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/dodutodas.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/39321567159.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v9k1opslm8u0t1ijbov6tgtlq7/52056193840.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xetejexowiwozadiri.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/musofuguzojolerekolofimis.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/wamuboduto.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/saxolejosuvefigudi.pdfIn PDF document text
    • http://jinyezi.cn/upload/91167428660.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051946356207.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/tavexavofizuf.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/dexinapigezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+unit+test+mock+contextPDF 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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 15264 bytes
SHA-256: 445228eb6cbe04ea230d745e0753ac0aaf365d3ac449aa76f1422f65f2a36fe2
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 10600 bytes
SHA-256: b29f9d868cf42dc2071d5852ef541565d3eec2376ec29deff507f243643fff84

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