Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf168a35a1cc43e…

MALICIOUS

PDF

85.3 KB Created: 2021-01-15 13:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8168603db15fafa8119e0bf75bea503a SHA-1: 9a5270ef23926edcf01704e04ff487e85d89df70 SHA-256: 9bf168a35a1cc43e98e0ddb0115c59a43c3b10a14177a6ba413fdde7b7559f5c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The presence of a ML classifier flagging the PDF as malicious and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/aws?utm_term=ardaas+punjabi+full+movie PDF link annotation
    • https://cdn.sqhk.co/gotofebelu/aXlRjhr/reading_comprehension_worksheets_4th_grade_with_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/fWrhghe/26148375937.pdfIn PDF document text
    • https://nenarixu.weebly.com/uploads/1/3/4/8/134899789/1943308.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/jjRauii/gawumarekeburizikapivoro.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/5346079.pdfIn PDF document text
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/ronivumumid_pajabofubi_xunebi_gipixikegere.pdfIn PDF document text
    • https://kofemadaki.weebly.com/uploads/1/3/4/6/134675418/deb7a8ff.pdfIn PDF document text
    • https://dedofuzogod.weebly.com/uploads/1/3/4/3/134374436/a69285cef6ab.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/gekikuve-xakuv-kefopawax.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/3957612.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/derubovikobagap.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/vimupikipafusox.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/7de577.pdfIn PDF document text
    • https://didukomam.weebly.com/uploads/1/3/1/8/131857465/gusevuzow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 5452 bytes
SHA-256: b260c56d2ffb0b213713496ccf6b6058bb39129455dcc5fe36b2f1b506407d62
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 6800 bytes
SHA-256: 8e889f3adf2759b42c9bc5b1dfb55dc8e439b8e8db301db9d229381d82cf9a4d
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 11472 bytes
SHA-256: 73a2a0d8328b2a5607ec09033f9c2831a94e3ef22d4193d9cd437278c0cb64b3
font_03_sfnt_off000131b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B3 16368 bytes
SHA-256: 2c5f51a476b4274b6b900fbba81fc97c04b4f1697b1aac53cf696a9c53e0885f