Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91350a4a6669cb0…

MALICIOUS

PDF

83.8 KB Created: 2021-06-06 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 97558c62891b90038dff4f16a869fb3f SHA-1: 223807d2975bdcd31960b2f237e0a0d7c5d5feef SHA-256: f91350a4a6669cb0f4156291b669fb1940817ce7f903de6fe2d9844967e1bdab
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URL and the nature of the link farm indicate an attempt to redirect users to potentially malicious content.

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://allytemp.ru/pbw?utm_term=how+to+connect+harman+kardon+bluetooth+speaker+to+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504922/normal_602d6bf368841.pdfIn PDF document text
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/f17e5cc5c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380078/normal_60affb608647f.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/zelekeserow_wisozikuliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_6061387bcba5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_6058dff9c3d69.pdfIn PDF document text
    • https://farerobizu.weebly.com/uploads/1/3/7/5/137500523/5100518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_60b912eec616a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404292/normal_5ff6d2b6b8767.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/492142994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_602bedf0beb4f.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/e1d14e76-ccd4-4fd0-bbcc-2f03f7e6ec11/how_to_trade_forex_online_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e522d906-eb34-425d-b7f7-1644e211c1ea/how_to_find_someone_car_number_plate.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144650502/36335669590.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144438297/guxiluxipixuropefaxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8888fe-1cbc-41b8-bc04-2366e6dfdaee/descargar_mi_planta_de_naranja_lima_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027f90c9-b249-4c38-80b7-0248e34a6e7c/are_spotted_lanternflies_dangerous_to_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbd0eb8-9a89-4c2a-b1cd-1ec4cf59e0b8/92467418353.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144440976/padma_puranam_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ac0919-513d-4d8e-977c-e35ffeadb974/greek_god_names_and_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81316b8-c3fc-4c36-9c5d-dfaa33f6d24c/nikon_d40_price_in_india_2019.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144544335/cost_of_post_nuptial_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6b1569-f6b4-4ed7-ac48-403ac26c0566/delonghi_nespresso_lattissima_touch_coffee_machine_manual.pdfIn PDF document text
    • http://buxozodevoge.pbworks.com/w/file/fetch/144613698/celebrad_a_cristo_acordes_torre_fuerte.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_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 5628 bytes
SHA-256: 961e9aab280b432254c8aedd3229a0605c2984cc42eba608a0af3279ee888de7
font_01_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 10908 bytes
SHA-256: 87dc039e5a32fbdfd7950d5f2cc3d5813b2a7d6dc8a4e072a875baf48f9e856f