Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdda37ea44d6dd1…

MALICIOUS

PDF

85.4 KB Created: 2021-06-02 00:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d9329044ce0299e2acfa0cc3bf0d4bee SHA-1: cdfb0c40e9ade99ce38ce570c8db03c46b820c7c SHA-256: 8fdda37ea44d6dd16bd8e7e8e255ba08f7532f863f5e85b607643e5ed953db38
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the link farm. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=minecraft+building+planner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475739/normal_6064100a1dda1.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/5efaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_604fcb3824fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377098/normal_5fcc73c44e60f.pdfIn PDF document text
    • https://julupeti.weebly.com/uploads/1/3/4/6/134608278/a97295bf372565.pdfIn PDF document text
    • https://xedazebo.weebly.com/uploads/1/3/4/4/134497739/tukude_disalo.pdfIn PDF document text
    • https://gususofutuzur.weebly.com/uploads/1/3/4/9/134901105/e3a0cc4fd60b6.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/76be367221.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/c58cf3e5-0470-4d9b-a79d-79e10ea60235/does_costco_sell_infant_car_seats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d176ec-0579-4357-8edc-9116bac3a10d/stephen_king_skeleton_crew_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ace233-0fb5-46b1-a242-bc656cc54cd3/beats_by_dr_dre_powerbeats_wireless_3_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd751c38-8924-48c0-9ab2-2f6cbe4c2bf7/polk_audio_psw505_12_powered_subwoofer_-_up_to_460_watts.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144481131/korasutudofen.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144480597/jugoxivusutodufewuxoxod.pdfIn PDF document text
    • http://garigor.pbworks.com/f/37896992815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b223cfb-65b2-4727-ba94-be3ed2bfb2ed/49978689269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c61a92-1e61-45fe-9266-89a6d033e139/gestion_de_la_calidad_total_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774ab5ed-19d3-41fb-a105-e5f13b574bd5/toque_de_bandera_letra_completo.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/medamuxamulemejufade.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5288 bytes
SHA-256: 1337f4cfec37ccee5240273d5f32d7e51cab532dc9738325b076eefefe150fe3
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 8996 bytes
SHA-256: c0fccda92772a02eda62ea392b463cae6bb2a7bcf769c638d252f1cf44e23940
font_02_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 11352 bytes
SHA-256: c7be403aa8530179c6f4f4ffa2c2ff8585106db8f88430ee5280dafe634f0882
font_03_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 16124 bytes
SHA-256: d4e00368b4eba22cd1780001ff13049ec204d8c256fcbfd6818fe10386e22f07