Malicious PDF — malware analysis report

Static analysis result for SHA-256 23780be60de7cf75…

MALICIOUS

PDF

77.3 KB Created: 2021-05-22 21:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f94d3213fbe52466c4f4f69438d05fe SHA-1: 944992fa6fae8b38725c183dc65c4f4789b52d4d SHA-256: 23780be60de7cf7591970c53f38e7642b045e1488cacefaebe44cb45e7fc1532
156 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, disguised as search results, with the primary link pointing to a URL related to 'how to save preset hx stomp'. This technique is often used to direct users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/wb?keyword=how%20to%20save%20preset%20hx%20stomp
    • https://gozowejikagigu.weebly.com/uploads/1/3/5/3/135345496/b06aede.pdf
    • https://static.s123-cdn-static.com/uploads/4390057/normal_60067af92cbb4.pdf
    • https://gojanevalu.weebly.com/uploads/1/3/4/3/134353606/4cad67dd.pdf
    • https://static.s123-cdn-static.com/uploads/4386618/normal_6005492a3eac4.pdf
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/b7c9aea.pdf
    • https://cdn-cms.f-static.net/uploads/4465703/normal_605b06750bb07.pdf
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/7720629.pdf
    • https://cdn-cms.f-static.net/uploads/4490519/normal_601d5c7e9093a.pdf
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/7738651.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xakajoziwibi/potip.pdf
    • https://uploads.strikinglycdn.com/files/4dd00a39-c4f0-49ff-8ed3-f8facfd98df3/fubikapejuse.pdf
    • https://s3.amazonaws.com/piwanisaj/94233477033.pdf
    • https://s3.amazonaws.com/pavujiniz/zadezel.pdf
    • https://uploads.strikinglycdn.com/files/07367db3-fa64-4832-9b87-43e4f275392c/how_to_start_your_own_video_production_company.pdf
    • https://s3.amazonaws.com/viregujipowuru/xesalavuragatikowijoket.pdf
    • https://s3.amazonaws.com/kegubinefuda/munuguzawad.pdf
    • https://s3.amazonaws.com/senodiw/iphone_camera_app_raw_format.pdf
    • https://s3.amazonaws.com/bugutaj/sorting_3d_shapes_worksheet_year_3.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_off0000e12f.bin
87b085b69e232bab50072b5a2934ecf9ddda497f904f57771fed5df13a88853f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 4840 bytes
font_01_sfnt_off0000f1b5.bin
27a0a3f6cfd7844ca8e4a8a472a1a94b76e059e342310a3c5818589457f72d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11372 bytes
font_02_sfnt_off00011864.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 4324 bytes

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