Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c23d17e6a7f4df…

MALICIOUS

PDF

97.0 KB Created: 2021-03-16 20:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9133d05371aa9e69e957478caf9ef8cb SHA-1: 601369e6fbdb8a08640447e750f46b2eaf088c15 SHA-256: 35c23d17e6a7f4df91cec304f831bc604eab2ad4e96dbbe007ac136aafceaa24
156 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 file-sharing services, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=objections+in+court+cheat+sheet+australia
    • http://robugipunebib.mygamesonline.org/buxesitakokubamumadefa.pdf
    • https://cdn.sqhk.co/mobovogoneja/giCqiiC/lanadugutosufinomij.pdf
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/9606006.pdf
    • https://cdn.sqhk.co/ketixudolu/ghjhgON/46373117488.pdf
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/bupukasezitom.pdf
    • http://xubanapirobula.mypressonline.com/oxford_english_dictionary_free_download_full_version_for_windows_8.pdf
    • https://babapijolirex.weebly.com/uploads/1/3/1/4/131409508/3de5cc18e410c1.pdf
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ff58d7124a3d.pdf
    • https://cdn.sqhk.co/numiwufeguv/ZXicxFV/pinball_game_download_for_windows_8.pdf
    • https://cdn-cms.f-static.net/uploads/4456377/normal_6010738e5f5b2.pdf
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fdfd1ae436b7.pdf
    • http://xanusojuruxu.sportsontheweb.net/36545131065.pdf
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/tozezakoredisop.pdf
    • http://zunuruxeguxifi.mygamesonline.org/how_to_clean_dyson_dc41_brush_bar.pdf
    • https://cdn.sqhk.co/duburijudi/sjdhhie/70379833261.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_5c9f49d9e71e4333a142ce5852254d94.pdf?index=true
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_8302af0115b748b4a2cbd63770eb012e.pdf?index=true
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_fed9994812824ba4a7554a56c858b232.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_b9555e1940ad441982860129a493d76e.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_1600c6f7dc354addab0d46f4bd0a7aca.pdf?index=true
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_ed51dcdf79174665a2a670b275955585.pdf?index=true
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_b9df12e9be01424b92207f3156d8dc76.pdf?index=true
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_4fe9419b12fc41bea72c94605569a401.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f7c.bin
0a763024751449b79489c13ee95b93a397e05c72687afe6b762aca58a69cdca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 5132 bytes
font_01_sfnt_off000150e8.bin
237d1fedb71bb8049f95b45f657cc7c37c3116f07e84122f5f7609c072269b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150E8 10888 bytes

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