Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544771c1fdd03c4…

MALICIOUS

PDF

74.2 KB Created: 2021-06-12 22:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 47d3ef60033dedb22b578565da37bc65 SHA-1: 5280166a155ba9439e34b2a42a4f24decc4d17d3 SHA-256: b544771c1fdd03c4a5d4564e7ab3f63084c7efa75af86c38019e591b9ba9d691
156 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 phishing or trojan threat. It contains numerous external links, suggesting a link farm or redirection mechanism to host malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://huntic.ru/pbw?utm_term=davido+blow+my+mind+video+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454684/normal_6026bbf217874.pdfIn PDF document text
    • https://ziridizozavixik.weebly.com/uploads/1/3/4/4/134400570/7699d8411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_60b92d905121b.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/golodovobokerusuruji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6036851892b97.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/1851f1b9-a06e-4f2a-89d4-368138d7b25e/what_is_strategy_in_business_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e0c695-d17c-482d-8726-fd4390f0954a/how_to_calculate_income_per_capita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea6c43d-9502-430b-9db3-f9e96cdea0e1/dokuxukibepidewudefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7655d85-1242-48da-b10d-5ee1eb14c7c1/rufevazol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff75ed7-6f42-4c59-8154-6c022c4cdf99/anthony_de_mello_books_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e73f802-5a6c-4ebf-85f5-b05c3bf28e89/vezuzaxubuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d32b49-5bbd-4615-86da-59f0ce7eb0c1/spsp_2020_conference_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01eed87d-0d79-40aa-8471-02d73024692e/mubawati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520eaace-2987-4b9e-8a74-865075491f95/ruzavogigusid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3af5d4-4380-4d5a-bd52-34360ee8d862/xezufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12334ecd-fed7-4f70-aab7-c4d062281e58/funovutidagowifeloras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390fd6c9-47a0-46c7-98fd-43be55745a8b/how_to_determine_the_type_of_intermolecular_forces_present_between_molecules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3ed02f-0863-4376-b27e-b2553ddfd616/what_is_1_enoch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5e6fe9-afe9-4cec-96fb-62f38ac33671/zubitivonuzim.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 5092 bytes
SHA-256: 126d4bd2b6642b46f87cc2c4f9156f0ca9899bef2033fac3197bfa2d9072ca11
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 10412 bytes
SHA-256: d672e33c69efa4123c26e4c4d1d8cb22e1361f16733127b373c7af0e6b8b178c