Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a1f16858503a3e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-14 13:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7fbe5654e646ef9bfa3808b0866db1b3 SHA-1: 4ef4a1eecc2cca8a7d5d877ad8884001f108cd2a SHA-256: 55a1f16858503a3e261a1e1123610c6a7f8323d88950feffbc9ceeb4c27ed006
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme. One embedded URL, https://ponafet.ru/wix?keyword=ppsspp+gold+apk+games+dragon+ball+z, is particularly suspicious and likely leads to malicious content or phishing pages.

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://ponafet.ru/wix?keyword=ppsspp+gold+apk+games+dragon+ball+z PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407810/normal_60258cbfc324a.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/fneaUDj/oregon_ducks_football_schedule_2020_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/bjjihgj/cops_and_robbers_jail_break_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/ajhifsy/pseudomonas_aeruginosa_infection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_600a5f152f75d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5fc74fcfcdcde.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/QhihdgO/celebrity_cruises_us_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5ff9e170b847b.pdfIn PDF document text
    • https://cdn.sqhk.co/pazoxini/eitjeuj/beautiful_background_pic.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/05f2ed50-b19b-403c-a4d3-8e24ad0f66b9/poulan_pro_pp5020av_parts.pdfIn PDF document text
    • http://renumobopus.rf.gd/modaradanenodamiboj.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_098c44cc9632494c836e14f9162cdf9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b660a84-0b9b-43b5-b16d-a27eb8f663ef/consejo_escolar_de_participacion_social_hidalgo_2020.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_86c0524aa406474d9d6550965f69f82c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2f2f11-cc1a-4be0-b2df-9574e8a10816/why_is_the_prologue_important_in_romeo_and_juliet.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_6e510fe1c82e45adb3ce69fc1afc9763.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_e56243ecb6084e159ea481a1fa097389.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_9b2e6ad16fde4dbebe480d35fced26e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cc0a99-8b6a-49e1-907d-72041c461921/5326311481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d60aa8-e6fa-4f81-b66c-b0a3acc438d3/60326963345.pdfIn PDF document text
    • http://dotenax.rf.gd/7996229421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682b47a6-648c-4487-a790-0aaf23c75b4f/kapalanilegipolisomax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cd461d-9d05-43cd-bee8-b1d7fa7aff2d/plan_y_programa_2011_tecnologia_informatica_secundaria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5080 bytes
SHA-256: f7b2e4a34eb105d495a3f8d7a313e6fb29b26c6c399fd661ec29c7dfd4dcd977
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 5532 bytes
SHA-256: 28a0e8745976ae29799ffba35bf95e4267d9fd36c108c7e6475fe991e9e99a9a
font_02_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 11260 bytes
SHA-256: 9a57dd1cc6adc96d86c4e892e5d9d691a94c2111fbd92b1558099cd4a33ea662