Malicious PDF — malware analysis report

Static analysis result for SHA-256 053015bc38bee1ba…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 21:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ed85439e79e711083cd5b723611b91b SHA-1: 3baa699f20ba1a8802b0ddedd0cdc438c088acb8 SHA-256: 053015bc38bee1ba8f6d02b8a70d2129adea8eaa94d4575b39785123b3633a78
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+to+tig+weld+basics PDF link annotation
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/93a7d6d015619.pdfIn PDF document text
    • https://wevubajapema.weebly.com/uploads/1/3/5/9/135958203/5324638.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/96795936146.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/cUljjML/marco_s_thin_crust_pizza_nutrition_medium.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/lugixebipukin.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/iaGseha/bird_adoption_las_vegas.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/8726188.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/40860054098.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/jisI5if/goat_simulator_trophy_guide_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/bWLgfii/80061547190.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/a7e1c366-ad8e-4c58-bd82-de38eedab071/senco_nail_gun_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e01af8-6693-4c98-9e33-6ea36791aab7/restful_web_services_authentication_example_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd5160b-6fcd-4d8f-9107-3aacecb95738/3323511122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138d463e-860f-4df5-a946-f77897a40932/dometic_air_conditioner_parts_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/lurovowunaxuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecbaf6a-3316-411b-9445-d78e8d3ca8d9/hillsborough_county_school_hours_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/61675760506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffde2dd4-b391-4e1d-9aa5-9faf42e4e16a/canon_mx432_how_to_scan_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/anesthesia_technician_salary_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa36e4b-fe6f-4d1d-8d71-7c57858119a2/jivumuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd90ce6-43fb-46e3-9bab-51a9240e602b/eliphas_levi_book_of_splendours.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/you_again_full_movie_720p.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 5204 bytes
SHA-256: 06d076229130eef2c0094664e98511ed13db1187b966986befaa4111f31457dc
font_01_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 10752 bytes
SHA-256: fdd24c65a028f1461611fd3bdaa54ec5616a2a21a81758bb8dceb85c5922baca