Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5f186b47ec6267…

MALICIOUS

PDF

85.7 KB Created: 2021-03-26 07:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6af31ec5d124b20a4d7a56e28637b6b8 SHA-1: f607bc0e1a40e4f70f9ba90b837d1b26210771ce SHA-256: 8a5f186b47ec626760eb7195a91cdfdd99680e96e3d23d6926ce81288cc791d5
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 a large number of external links to various websites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest a potential phishing or SEO manipulation scheme, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=innocence+ex+guide+ffxiv PDF link annotation
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/fumedidejol.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/medical_certificate_format_for_sick_leave_for_students.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/ways_to_prevent_climate_change_at_school.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/coordination_isomerism.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/firedutuwurid.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/zovepujavakoxupujofoga.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/jd0Yihf/88743438400.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/how_to_change_the_battery_in_a_dodge_grand_caravan_key_fob.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/iaRJAkY/water_glassing_eggs_video.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/ignou_bsc_syllabus_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • https://potigaguw.weebly.com/uploads/1/3/0/9/130969810/6345742.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/f16483d.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/6211928277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d86726-3872-4cde-aec7-21863afae539/employees_only_beyond_this_point_traduccion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e7adb5-04b7-47fd-a5c0-b32b562f3b75/18452142274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed623fbc-880e-4e0c-8121-423e54351475/zikikixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96717d62-c09c-4ab2-980f-dfb06b1b6ad3/data_mining_jobs_salary_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63026a4-c673-4e91-934a-bd46c5c3702e/is_oreck_a_good_air_purifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d2c25b-057a-4b73-9836-66bf1cc80ce8/xuvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c6b8d0-8e8e-47dc-90ff-d4e5ac6c706e/bosch_300_series_washer_detergent_tray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c59a0c2-79ce-447c-b6ca-4ed8dd6780a9/48152756006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ef6814-dd53-4220-aebc-a7938875ae72/50834188833.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 4740 bytes
SHA-256: 30dfeb4597daec4fd45b80ff13b09c789cb0e41a865039564a5357ed875e1a9a
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10376 bytes
SHA-256: 6e28972a0630d41fa4c3fdce72046285c0d21bbf022cc9f49d6492b982e5f6d3
font_02_sfnt_off0001342f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342F 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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