Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8c0500b0a5dc5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 02:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 53b9ff2f7d3f4868130a66218715c685 SHA-1: 44331d474ae2fc4bea11ba272451aa063a713c43 SHA-256: 5bc8c0500b0a5dc552fe7f6333b5109b483c773a51eda62202d931349f29e500
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, with heuristics identifying it as a link farm, potentially for SEO manipulation or to distribute further malware. The presence of multiple external URIs and the link farm behavior suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wix?keyword=cnn+10+february+4+2020 PDF link annotation
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/7397959.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/xitadukedejopaja.pdfIn PDF document text
    • http://zubiki.top/how_to_file_for_marriage_certificate_in_the_philippines40zp7.pdfIn PDF document text
    • http://geleostone.online/93485558092pvcwu.pdfIn PDF document text
    • http://gvidilon.ru/911036235272eqrb.pdfIn PDF document text
    • http://normaa-id.com/915923890776yny0.pdfIn PDF document text
    • http://kleomaften.online/98917778666ce0yi.pdfIn PDF document text
    • http://activa-fb.com/bemoteviwewimip9p7cx.pdfIn PDF document text
    • http://ecoservice-vlad.ru/the_secret_order_3_ancient_times_download4thla.pdfIn PDF document text
    • http://katermore.ru/what_is_reading_and_explain_the_types_of_readingm9hyc.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/4db4618099.pdfIn PDF document text
    • http://goldstein.capital/2005_pathfinder_transmission_issues63v7o.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/tokitebuleleta-sevugelumureb.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/nolokazemadoboviru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_dd9d77ef85f54bd198f745f263a0ae10.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_d43f02d518e04364bfa34155f49a9db4.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_9e833774ff264c4da7b32700ab01ba10.pdf?index=trueIn PDF document text
    • http://dosidojabar.epizy.com/bluestacks_install_apk_from_pc.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_1ee17e0eeab1442082b72f3e24d2e55e.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_38ac4fdb56244ff49d65b7963d35a668.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_38b9404fc95944df8842a1ff26ea2812.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_b955920c7e574e5ea040b4383f3757da.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_f9fd740d493640118476b731dd64a69e.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_46cc70ce542c4548a989692c4cfae1dc.pdf?index=trueIn PDF document text
    • http://sudatidi.epizy.com/muzokiw.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 5112 bytes
SHA-256: 68cac4c942648fadb0757e4942979fae6a92e6b97a4ebd5e8fd1024527caa6f6
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 10320 bytes
SHA-256: 271912d5270e8ed9bd4985e8d29e590cc20fc4b43d735a5ac25688f377c222e1

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