Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b018ee7ab047d98…

MALICIOUS

PDF

71.3 KB Created: 2021-02-16 11:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ce3b82785f6ff0cdc43d4c1400320a SHA-1: 78322a40e674d0420fed21fb45a834f954929038 SHA-256: 7b018ee7ab047d98c65cd633e9fc82e77c35058d97a37d2b704643250fd3d5e9
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'Download Button' heuristic further support the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=keynote+4+answers
    • https://static.s123-cdn-static.com/uploads/4474450/normal_5feb1d9f5afca.pdf
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/dukirikadebaf.pdf
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/topuv.pdf
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/5748058.pdf
    • https://cdn.sqhk.co/jepivitixiwo/h9eJUia/76778974580.pdf
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5ff9d9351eed4.pdf
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/mupozowevugufox.pdf
    • https://cdn-cms.f-static.net/uploads/4366000/normal_6014ba95362cb.pdf
    • https://static.s123-cdn-static.com/uploads/4480584/normal_5ffb68a6d9886.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/ruguj_sikenepebafibix_paburabas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nuxepiduded/cover_letter_block_format_spacing.pdf
    • https://s3.amazonaws.com/xonaxevetaf/24019519255.pdf
    • https://s3.amazonaws.com/xulikamul/free_guided_walking_tours_rome.pdf
    • https://s3.amazonaws.com/tuzamada/noxabasewazuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b3.bin
fce9f58237f35324d7d2feaeb7d7bf22b7a9136aa88d6592896fa52f56c75b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 4636 bytes
font_01_sfnt_off0000e096.bin
f19e51465a7cda94aae57820d2a5113a40fbb2a88d4eef0c1f4fd44f5d23a8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 10076 bytes
font_02_sfnt_off000102d0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 4324 bytes

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