Malicious PDF — malware analysis report

Static analysis result for SHA-256 59932458b9a7c3b7…

MALICIOUS

PDF

77.3 KB Created: 2021-02-28 21:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 768a2a41e5f61434cb1fa4b65ffb99dc SHA-1: c53fa75cb51fb059b24f6d176b90c1cc6eec66ee SHA-256: 59932458b9a7c3b77ecb805f333345a554681e6e6ff9e7401830c0415063bb3b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and a high ML score, indicating malicious intent. The presence of numerous external links, including one pointing to a potential phishing URL, suggests the document is designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest it's part of a phishing or spam campaign, likely leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/123?utm_term=la+gallina+degollada+resumen+yahoo PDF link annotation
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/3178736.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/ahiichf/dupogaxorotefowazemiwed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495034/normal_5ffcb7ed8250c.pdfIn PDF document text
    • http://supsun-aero.com/the_gender_secret_series_review3j0ax.pdfIn PDF document text
    • http://dronextactical.xyz/c_programming_tutorial_video_free_download_in_hindibvewy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455405/normal_5fec91ca8f8d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5ff91926ed680.pdfIn PDF document text
    • http://braco.ru/kapimemubejajuxagikucl6f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488329/normal_5fde8312a9fcc.pdfIn PDF document text
    • http://unreguezff.rest/determining_the_limiting_reactant_lab_answers8o0tu.pdfIn PDF document text
    • https://cdn.sqhk.co/xajimujigaju/Zhhhd9t/87861911996.pdfIn PDF document text
    • http://znakomstva69.space/lozetasupifotuxasep4356v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_601884fc80859.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/rainbow_loom_instructions_with_pencilsq5ijz.pdfIn PDF document text
    • http://znakomstva18x.site/triggers_marshall_goldsmith_quotes4a0ws.pdfIn PDF document text
    • http://help-nanny.site/lr_eswari_amman_songs_free_tamiltunesoehv6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibaxet.rf.gd/96003198979.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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 5280 bytes
SHA-256: bd01406044d2504ae18d3a368317794ad28371059c65c9e75d638fa7e8b85e17
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 11744 bytes
SHA-256: 10ffc88f5646694ad8c31971dd2fdc7aeb74e191e2d03014d69fec499ff9cd2e

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