Malicious PDF — malware analysis report

Static analysis result for SHA-256 7538fcb5e1af8905…

MALICIOUS

PDF

80.4 KB Created: 2021-04-16 19:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b257abb6196c55279c26b9b43bd7ef6d SHA-1: 49729d86a7acb4d20e5e6ad92625326c2d2ed523 SHA-256: 7538fcb5e1af890560ac4757a9484c27509a014b9676cc44bdbc0089abd5444f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs like 'https://maypoin.ru/strik?utm_term=is+keto+academy+worth+it' are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://maypoin.ru/strik?utm_term=is+keto+academy+worth+it PDF link annotation
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/bomivugabawogorol.pdfIn PDF document text
    • https://zuxolizaf.weebly.com/uploads/1/3/2/7/132740519/a0ccda5c1add01.pdfIn PDF document text
    • https://zipusuborulam.weebly.com/uploads/1/3/0/8/130814510/9868227.pdfIn PDF document text
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/mivaxedixevot_fefilekawono.pdfIn PDF document text
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/4597250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_603618050534e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5fdf9ab550f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_60199752e2e5a.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/44951876819.pdfIn PDF document text
    • https://favekenada.weebly.com/uploads/1/3/0/8/130874403/xezevapi_koxavupufawiguk_dugebiwugakiw_zawagifuda.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/menebimadagodutiv.pdfIn PDF document text
    • https://rovatelafewi.weebly.com/uploads/1/3/4/3/134392743/3661946.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/zepamixafo.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/7960989.pdfIn PDF document text
    • https://wuzipagaxu.weebly.com/uploads/1/3/0/7/130776492/45977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_6038933c551b7.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/9d893871-f3d4-43ae-9ba5-16c2c705f4fa/what_shells_can_a_mossberg_590a1_shoot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67092fc9-5dc3-41a7-ae28-6e771c1db88b/how_to_draw_a_christmas_tree_easy_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5151164-a9d8-42f3-ae7c-592db6f238f3/define_water_activity_in_microbiology.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_64d6e76504944c819edc7abaed72b54d.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_150d507c74cc4d1091a3276c4b008526.pdf?index=trueIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/iodine_value_calculation.pdfIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_05013e82772a48b0b4ca5728ee509596.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_be2f9c8829d14f97ba5545142e78a610.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4e30af-c3d3-4a26-afeb-7a5581299559/vejinele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aab7b90-8673-41cf-b4d9-856cd297c000/does_gta_v_run_at_60fps_on_ps4.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_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 5344 bytes
SHA-256: 4b34e72a49235ae61812d91ec5d5aa958623e4a4f43a702e2ed7981904898266
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 10972 bytes
SHA-256: 69fb850cf68e23b34c4f6fa49a1f977355a1e641c1d77978e2bcbf0649cc6083

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