Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c22c3c5c4f74cfb…

MALICIOUS

PDF

77.5 KB Created: 2021-02-24 03:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7cef38e54e3b705ce6d6113ca75c3384 SHA-1: 68a133cecf6cef28bb5332382a2b418750d0ef66 SHA-256: 9c22c3c5c4f74cfbf8a0a9d3743574f1f17dbbab8e08110a726ded361390becb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest a phishing or SEO manipulation tactic, aiming to direct users to potentially harmful websites. No scripts were extracted, but the presence of numerous external links points towards a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=relieving+letter+india PDF link annotation
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/3425122.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/gdx0jfz/1_image_4_words_level_18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60250dfd87ac6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fe9c9e59c90c.pdfIn PDF document text
    • http://birjand.design/how_do_i_setup_my_belkin_n150_wireless_routerayl72.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/ajihdjj/42497070239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_60311bca2e1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_60157f1fbaa29.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/f2035ea0c136f5.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/fObFjjc/speak_to_voice_translator_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367286/normal_5ff5b244a4f7a.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • https://s3.amazonaws.com/pubopelej/blender_armature_deform.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/type_2_diabetes_mellitus_treatment_guidelines_2016.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 2388 bytes
SHA-256: 9b707751075ee786b906fdd28dd29d92e07e10b044adeb74eefcdd5709952f98
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 4560 bytes
SHA-256: a904652e635089ff2fbf3eaa3839e15fabcf6a996c21b5f81efbf8c694e25bdd
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10032 bytes
SHA-256: 1a6c860f6e5f2c20bdd995cf54ac8a1f60b5adabdd1745aedd51f86a09b84f3d
font_03_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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