Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1356749b7724f3…

MALICIOUS

PDF

73.2 KB Created: 2021-10-01 11:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a51d006a8ee58a88127aa1a370dcd005 SHA-1: 968048b402e1e67d20733b2a7be995ac12895b01 SHA-256: 6b1356749b7724f38ed9ce335fc39f861406dcc7e734fa323f4a60bd1205f534
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nmg.lv/img/uploads/files/nobafegod.pdf In PDF document text
    • http://qdjshg.com/files/file/70392434471.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/66544024154.pdfIn PDF document text
    • http://sptcrane.cn/d/files/98736712385.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/41414308929.pdfIn PDF document text
    • http://prograsifkalip.com/files/51025899070.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/30713179226.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/62592235397.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/23756117163.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/51713268712.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/rokaberedepeva.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/16869163733.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/joravisorevete.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7d51aa4b---maduborinumerimu.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/10315624098.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pujolekifexu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_055924_185.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/52968042260.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/nepilorakomavusuzewuzusu.pdfIn PDF document text
    • http://client.diffuse.info/files/40648035421.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/26554939529.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/55442437301.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/48514713328.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/desegopufutu.pdfIn PDF document text
    • http://henca.com/files/details/file/25983945727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+mog+orgPDF 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_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 17600 bytes
SHA-256: 6601a4536589ec3e8a8c4d7bc95ab142712202c2bb52c5b9c0882715438b0a89
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 9968 bytes
SHA-256: b8f10608e57604bfc86b9799ba08a1c1e2406b141e1470b0587860f2489c5ea4
font_02_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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