Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9003f8f45af79d…

MALICIOUS

PDF

77.3 KB Created: 2021-05-23 16:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f446d5bac2c3224b58e0f0d6f4353f05 SHA-1: 9045104ec84e7d7968310147aa8e21405d6052a7 SHA-256: bc9003f8f45af79d49fe842cbecd346b27b3c3b2c242039e6ba44ce2eb4d220d
156 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 of which are to benign-looking documents, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a mass of external PDF links, with the primary malicious URL being https://gimoguvi.ru/strik. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user to a malicious site.

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://gimoguvi.ru/strik?utm_term=mass+of+a+joyful+heart+sheet+music PDF link annotation
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/rimusimetiguxuwun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5ffcf980cfabf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_6037db83566c5.pdfIn PDF document text
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/2e15bd008b961.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/9680cee65a33c1.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/vorazukaz.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/5dc1046d81e9960.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/d25845e950a.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/liwara/my_vacuum_cleaner_brush_not_spinning.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/what_are_the_5_methodology_of_quantitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/descargar_traductor_ingles_espaol_para_pc_sin_internet_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/freckle_juice_recipe_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/pdf_annotator_free_license_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/25577707173.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/jaminadetalipufalekeka.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/kofemumalute.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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 5304 bytes
SHA-256: c57008f8eb1637a183b2140694997c788ff979daf0e13f6692d538d79078d3f3
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 11124 bytes
SHA-256: 685131aa7fc9ed6576b779091a334a9d4bafb2c8ad50bf618fb7ab81ee7ce9d4

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