Malicious PDF — malware analysis report

Static analysis result for SHA-256 9208dbcd8158c29f…

MALICIOUS

PDF

77.4 KB Created: 2020-11-11 21:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9fa42c500967506d4c37493e64bd0fb4 SHA-1: de87665e62ed82715912af3adf15519e20e17ae8 SHA-256: 9208dbcd8158c29feaea3482eb62a534a237596ced9572f453377f086dc5955c
134 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. It uses an invoice-themed lure. 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/123?utm_term=real+property+management+desert+cities+login PDF link annotation
    • https://xidogofu.weebly.com/uploads/1/3/4/3/134307260/8144959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5faae699e1ff7.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/vimowozerezaxobita.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/1834977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f88c940e7108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f8e7bfabf9f4.pdfIn PDF document text
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/dexudijopoled_wowalobara.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/428596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5f922dc1ba909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_5fa4fe068a4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f961aa87dfed.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/c85f0cbef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fa7c5f5069cf.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/397b48ab74.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/lakadutof/antibiotics_review.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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5504 bytes
SHA-256: 2bf8c3e6d2a7ba616f64f5ccb8151cae16116340bc47077ca4809b01b95e42ec
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10548 bytes
SHA-256: 6396a5859f7458f11e088ddeb906c46ce3c21e902bebf2ee16165b46ec5f8fde