Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd4d1710f8aa0b3…

MALICIOUS

PDF

82.2 KB Created: 2021-06-11 20:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e1fa5380b31f566cf28680bd84fb98cc SHA-1: 3cf4df0b3412e07cb68e1fee43a7746ca725bf08 SHA-256: 9bd4d1710f8aa0b3aec34f7967f16ee249edc06d512796dd27b4b7d5fcd6a823
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=atomic+emission+spectra+lab+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388825/normal_60c0fbaf199b2.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/7631694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_6066b7a767982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_606e84722d6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_6060953890f3c.pdfIn PDF document text
    • https://mekivigabu.weebly.com/uploads/1/3/4/0/134096936/51dee4e.pdfIn PDF document text
    • https://migabodunezo.weebly.com/uploads/1/3/4/5/134587819/potidaguvesu-tafasamisuje.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/tujipufavexoxep-xixebo-gumumetudafewap.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144497859/95980481890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fceb64d3-4923-4af4-9970-9ad2524292b4/dinajufikoregopizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97806d3f-cc10-47d5-bff6-696bdf223a26/les_misrables_movie_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc78e407-dc1c-42cf-a000-ac2712f07409/39528151375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d61df2-da70-4ce3-a938-ad0b66a95ef2/11248961333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8ac3a0-9e1e-4070-9946-43bf91b417b0/corey_wayne_youtube_no_contact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d229fd-6d95-4887-ba67-d931e8d85012/selatedefemetuxelosoxu.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/mesopepog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8281c06-e58c-458d-b85e-07ed3e4ec183/59644080594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147aa5c1-592c-4ffa-81de-abaf16482e0b/how_to_use_sony_rx100_iii_as_webcam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf37b65-5b43-467e-adef-3df6c58d031e/what_is_the_average_cost_to_install_a_generac_generator.pdfIn PDF document text
    • http://todenulaw.pbworks.com/f/vector_mechanics_for_engineers_dynamics_solutions.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_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 1596 bytes
SHA-256: f7885f7204153e9fe5aee2783c9e2171ae9d152d5fa1e687ec261271605b7a89
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 5464 bytes
SHA-256: a243b864c4c1274183021681000ed7b22f2c6ff4ff1271b66584407f7042c043
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 11660 bytes
SHA-256: 34ff9d4aee30d9d688fdd8f7e658a55113c7ccba1b35beab1750816bc309a927