Malicious PDF — malware analysis report

Static analysis result for SHA-256 2379471c96eee465…

MALICIOUS

PDF

83.5 KB Created: 2021-05-17 07:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe749f702b507ec0d855bef2820627ef SHA-1: 7d431694e355019bb0d724d1e152904d4ebece75 SHA-256: 2379471c96eee465ed42f1efbaacf2f98aaf9baab827110dd048149a6878f5b4
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary redirector URL is https://fokemale.ru/strik?utm_term=girl+boss+sophia+amoruso+free+download, which is presented as a 'free download' lure. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=girl+boss+sophia+amoruso+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4506200/normal_5fe5a5be24a38.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/lufitogenaxefoginadafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5ff160c9b0d47.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/bihar_board_12th_exam_date_2020_science_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_601c61634713d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://moxadokikubod.onlinewebshop.net/allium_cepa_var_aggregatum.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/wejosebedazavelukar.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_48017d072cad4c47a13c480446fc1583.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/burger_king_breakfast_meals_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/econometric_analysis_of_cross_section_and_panel_data_solutions_manual.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_47c2fbccc9884af9be11d4570afcf3d1.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_38f4656784b34fd19678d4b64470ddd0.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_0a930658eeb740b0b7c8d26336a9f6bd.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_dca4dee0502743289337c1cebfbcb9f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/kobasonefo.pdfIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_a7772d967b4f44ea93b6802cb6a77c57.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_44f18b0852034fc19051fc7f96b07191.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_480336a54d01413db6c1c62a12ac811e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 5344 bytes
SHA-256: 047e2510f381a6042565bfe058c73a12e02530067d2204a710f772291a2eac5e
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11320 bytes
SHA-256: 08074aff49ffbd7b4dca8f9ba4b405d6625d1c0e6d73940fe30170b4f78bceb7
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f