Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec394c52448070d7…

MALICIOUS

PDF

75.8 KB Created: 2021-05-24 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e8e06345da6eb4eb4867b0f1b707cc1b SHA-1: d3ff5280a2b35b80d0ef1888f88374e485e8c39d SHA-256: ec394c52448070d743990aef71927ee6741afd5a9c93f72fef5f6438116181a5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=fem+harry+potter+is+a+hitman+fanfiction PDF link annotation
    • https://zitupakunetod.weebly.com/uploads/1/3/0/7/130739751/d07985d875fac.pdfIn PDF document text
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/02634f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fc9274da7a9f.pdfIn PDF document text
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/tisobamegov_jumojij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ff8c7358cd47.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/5124807.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/7544187.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/d756e7bc-09cb-4dfe-8113-38a47cdcb509/my_garmin_235_heart_rate_monitor_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498eadcc-bf2a-4b2c-b0e0-59a2ae994b92/sony_mdr-zx770bn_headphone_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7082df2c-230e-45bf-8203-7de691db9c52/56710949602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38290af5-25b0-42cb-b609-60c5caf1c26f/2098051918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c8460b-e8f7-4e4d-930b-a12cad87e8f3/tegekisawixuwuralisatev.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/is_wimpy_kid_a_good_book.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/boards_and_beyond_step_1_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdfea8e-d001-460f-8e98-d3da1ebeebbb/pogabekamokisejakef.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/navy_fall_advancement_results_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/rigesevuziwikute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc21a05a-a52a-47f8-b383-57bc42a87dfd/xetijajovujijikovawuj.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/how_do_i_add_an_image_to_a_photo_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b9a1e1-b964-4c28-966f-7b5a7403dd5a/xagofopozejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17ea522-2f53-488d-9b98-4ed09ee29973/farmer_boy_ag_ohio.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5280 bytes
SHA-256: 21b6711ae1d4e126d1e7dfc6fbca2f0d61caae440c5a90900c7aff75090e8124
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 10756 bytes
SHA-256: 304d1deead67fa90a1948e426a9b9fcbd6ab48246962470074e0c85935a4d1fa