Malicious PDF — malware analysis report

Static analysis result for SHA-256 314f1b9acb8dc73f…

MALICIOUS

PDF

74.4 KB Created: 2021-02-16 10:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba60c4a86b167d605ea7c02e83dbcbf9 SHA-1: 862b1135f34a23ba8ff535e314043251c72c520d SHA-256: 314f1b9acb8dc73f9aed87e37b373446e9883a6e575d4a71f22895fae093c41f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=legal+issues+in+hospitality+industry+philippines PDF link annotation
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/sutazepopolotut.pdfIn PDF document text
    • http://ledimpress.biz/contrato_de_alquiler_vivienda_wordsw8pe.pdfIn PDF document text
    • http://befigter.xyz/celi_3_testpkb4l.pdfIn PDF document text
    • https://duraxotiparukog.weebly.com/uploads/1/3/0/7/130776433/183049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5ff97a95e6ea7.pdfIn PDF document text
    • http://parrrtner.xyz/bebert0y1c.pdfIn PDF document text
    • https://sunozidugeb.weebly.com/uploads/1/3/4/4/134486191/sukeferu.pdfIn PDF document text
    • http://demask.space/gravely_atlas_manual7f703.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/4921111.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/1b77ae3375b13.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/werekuraneminuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fd62966610a3.pdfIn PDF document text
    • http://mxbur.fun/76330625975yym8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebejos/office_viewer_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/gejigulop.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 5264 bytes
SHA-256: 1fc973def2fb62f70b3d94380b088c3e4e6607120edd244d10bb072d81bada3e
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10340 bytes
SHA-256: 9600d3c1e880b57f4c9160f8359dccb7d2da61760f09b4d2687039f86d05b281