Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b42fc4a2f2af4e…

MALICIOUS

PDF

67.1 KB Created: 2021-09-27 02:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d2dd158ed9865ee0cf8310e3e595489 SHA-1: d1d6e8b4da640864ff1c224b8835aef224ad4590 SHA-256: 74b42fc4a2f2af4eaa7ee937d95c639b30cd3227348d1d0402aa762664ca32a0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Heuristics indicate it's a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to a malicious site via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.rpv-drachten.nl/files/file/zuwivazusimufi.pdf In PDF document text
    • http://domgr11.ru/uploads/files/6896152533.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/28665225717.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/rusizazibupikugepenubal.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t1rvas79sd8l8rrkn6ova4a63/ninisix.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/nurafe.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/35092557184.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/21450778331.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/56511596560.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/zalisezupe.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/notilelim.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/xovavagowe.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/10797300920.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/69815108206.pdfIn PDF document text
    • https://blugarden.eu/file/wotifazoporab.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/duvunumitawatuwikiwa.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lalorizeranuwake.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bijotilukekodawowag.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/23971482352.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d36725edce78df24fbbf070c4150af13/17266416751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+good+will+hunting+full+moviePDF 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_off0000aa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA20 14460 bytes
SHA-256: c072ef570b4ee0cd274d74453413e7b668cd7ee04b9ad5b05a8ab44073696b32
font_01_sfnt_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 10900 bytes
SHA-256: 79386eedbfc3790d754ff05f97a352ac5482a15978218c4fec47509c3be318fd

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