Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af76c1ef92e23a2…

MALICIOUS

PDF

83.9 KB Created: 2021-03-16 23:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e635bcc7af425463006905919a0068c5 SHA-1: e092c72d34e61f16f4184e7c7ba9612fb4d1b1e4 SHA-256: 7af76c1ef92e23a23b08ff28d8f32989107259337d6ccd09496cea6978a802cd
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=rxandroid+subscribeon+vs+observeon PDF link annotation
    • http://smallita.space/bsci_audit_checklistbybyn.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/7765316.pdfIn PDF document text
    • http://vengriya.space/jozuleveroviripubopanoxoyh8hi.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/699153ec9.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/defojumas-takupu-lejosoxixupom.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/bolovopizonuki/82697608740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1c6c60-ef9b-4953-a6fd-c8496dd7dd71/therese_raquin_summary.pdfIn PDF document text
    • http://fozipifi.epizy.com/seduz.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/carbothane_134_hg.pdfIn PDF document text
    • http://fejaxiwezi.epizy.com/friendship_day_speech_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d93698-f10f-4362-957c-44a49937ec2a/63146046779.pdfIn PDF document text
    • http://kewumexor.epizy.com/fearless_soul_guided_meditation.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/bus_games_free_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/27778245490.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/new_movies_free_mkv_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/repofaxeva.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5176 bytes
SHA-256: 4085be66af24d134d3b01966bc38f12df4fd0167a639916bd5f7b461251fc7d9
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 12108 bytes
SHA-256: c2297c1ff5ed87cec4607ab77343284f519dc0d7f6d55d70c25215f69b0dcf20
font_02_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 16060 bytes
SHA-256: f60502fb507c904334c4e6f64201f20e056641c8e54386132246a428bdda64b8

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