Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb95a1adb92d2f17…

MALICIOUS

PDF

103.3 KB Created: 2021-06-11 09:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93056c0152c41f2e4c0ac0c3ed68c17d SHA-1: 646a75cca815050cf5203fdeef10eb2bf338de34 SHA-256: fb95a1adb92d2f171a88266cb6e47ed00f2bcc870c231515f9f2514318407b7b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary purpose appears to be directing users to potentially malicious or scam-related content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://synerhu.ru/pbw?utm_term=purus+cricket+odi+download PDF link annotation
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/xomot_suzexepuduragu_damowumarofivez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_603fa37aee349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_6035575306f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_601a75e0135bf.pdfIn PDF document text
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/satel.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/217471e0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_5fe90d2f08680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426954/normal_6003c65f5830a.pdfIn PDF document text
    • https://vopezewom.weebly.com/uploads/1/3/3/9/133988608/3591057.pdfIn PDF document text
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/4034386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fe591a877744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_60287cdca9999.pdfIn PDF document text
    • https://limakeluror.weebly.com/uploads/1/3/4/6/134657352/30349c54c4381.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464323/normal_60b33ced4d22e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458631/normal_60062341095b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_5fdc27751a5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_60128fab1ee50.pdfIn PDF document text
    • https://kodusikur.weebly.com/uploads/1/3/1/6/131606179/4320469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_6029eec239de3.pdfIn PDF document text
    • https://sesuxaned.weebly.com/uploads/1/3/5/3/135349378/4257071.pdfIn 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://uploads.strikinglycdn.com/files/7af5fd70-2780-4d05-83b5-61af42210993/troy_bilt_xp_7000_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7e6245-8f48-4a18-8f5d-387664d66921/how_to_program_xfinity_remote_to_control_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e136a8-734c-4340-a775-d92e5c878c3f/how_do_i_connect_my_hp_officejet_4500_to_my_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d18caa8-f2bf-4555-a60c-d575d5c8d9c2/advanced_english_speaking_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088dd9b8-1693-4752-8244-960942382e85/83659607992.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 4972 bytes
SHA-256: fe8975a6383e362b3e4d96ed8002b75eeee202e348cc8c28d7bb105f158ba2a1
font_01_sfnt_off000142e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E1 12036 bytes
SHA-256: caa846a40562a660ea027a0711d084cc46592c37534f049fc2ef512fd35b97c2
font_02_sfnt_off00016c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C29 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off000180c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176