Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c19bd33b3bb333…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 02:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd876c06e02b0175d8888bc1118b2c88 SHA-1: e273623e01d88b8538c2d4b2943ca159256fa152 SHA-256: 87c19bd33b3bb333af09c965e2fedc3bb829f6ab1a85dfc90c1b44ccfebdd2e1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and the presence of clickable links, a common tactic to deceive users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it may attempt to download or redirect the user to a malicious resource, potentially requiring JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 69 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 https://nepaltrekkinginhimalaya.com/assets/userfiles/files/42062078284.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/savolopisugafesodigula.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/93690616125.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/paronatanosapezadupipasuj.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sosulubedobopixim.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/darivufigubakutodaviwozi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8552898b7ef4e9ab10caf936fa1867fb/xalivikoliposusivipuxop.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/pewuguma.pdfIn PDF document text
    • http://quetthe.com/upload/files/67117858764.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/nevusapubiguni.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/5810280067.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/kudizosiwejisisu.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/76777200060.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d822681021---95542013791.pdfIn PDF document text
    • http://trieuduong.com/images/Download/nujilawuvevurerawu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/58260036229.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/5637573589.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/24842887705.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/24657331165.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/sufudepolulesoj.pdfIn PDF document text
    • https://phuquiland.com/upload/files/41061065427.pdfIn PDF document text
    • https://phnews.ro/files/file/56782137742.pdfIn PDF document text
    • http://haai.org/upload/file/15222162150.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gororuxagijaxosipakux.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/60540071464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=physics+mod+minecraft+pePDF 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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10956 bytes
SHA-256: 5430f07eda0db4a8e9274a94e84a8b2ba2c025db529b12a838431cd03234a65b
font_02_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 14212 bytes
SHA-256: 1463ae8f048d8a4b50cbd61977a8cd7da5e29f8502d54236aa46323463540db0

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