Malicious PDF — malware analysis report

Static analysis result for SHA-256 70841833e3aa3e1e…

MALICIOUS

PDF

73.4 KB Created: 2021-03-03 05:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01c586c662f537b00af3f6bd0e89c189 SHA-1: 799e3d6de28d6a13a82adda91f2f359a39936a2e SHA-256: 70841833e3aa3e1e6c05b4f8a2f3d19cd279cecc5eb125496381ada27407a2ac
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. The document body, though partially corrupted, suggests a lure related to dog breeds, which is inconsistent with the numerous embedded links pointing to unrelated PDF files on suspicious domains. This indicates a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=how+to+find+out+the+exact+breed+of+your+dog PDF link annotation
    • http://pasetbs.xyz/clasificacion_de_los_derechos_humanos_por_6_generaciones6pwo7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6010c7e9bb47a.pdfIn PDF document text
    • http://leqqurint.online/scatter_plot_worksheet_8th_gradecv0nq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fe210402f609.pdfIn PDF document text
    • http://tryplafond.xyz/vunasoxufuztkq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_601ab882a2d89.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/BiedhaE/gakeduwapexebawajodoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_6006547005bdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369524/normal_5ffa8c3f1f061.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/jjxKcgg/paponoximoremobuloma.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/112837476.pdfIn PDF document text
    • http://robolab.one/psp_emulator_android_pro_apkjzeb2.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/gadinufovik_favarujuxid_tufijuverowew.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/Ngcjc9g/16465289472.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxaletadi/cMgcjdu/96990719148.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/mogipegi/67599218677.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 5436 bytes
SHA-256: 46b4cd676ed7d436c64901acb5c1f439d8160ec8d698f994d4d1acbc2dcb872d
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 11516 bytes
SHA-256: 5a352ba9b638089839ee65991a710fac8f9d5af73efee6b7029155211d0b2698

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