Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48a0fe2903bab61…

MALICIOUS

PDF

87.2 KB Created: 2021-03-28 01:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d62f962ae5ae0fafbe099dee38fc2d6b SHA-1: a50f724be01e3bd57571681f977933a0564a9b33 SHA-256: f48a0fe2903bab61743bb86894e3b6a69bb387fd50efba6e841168563160a443
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=how+to+get+a+neuropsych+evaluation PDF link annotation
    • http://national-verifyteam.com/41515435799xeimk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475995/normal_5ff1bba1d87ab.pdfIn PDF document text
    • http://getplafond.xyz/rigofoz3mgeb.pdfIn PDF document text
    • http://zoneeuro.pro/labepirm3g3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_603faa5b1e9fc.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/28468350565.pdfIn PDF document text
    • http://psychologyrelax.xyz/23846110141pajn2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367000/normal_5fe28c4886d79.pdfIn PDF document text
    • http://everydays.space/behringer_xenyx_x1204usb_price_in_south_africaca1ti.pdfIn PDF document text
    • http://golomashvanna.xyz/ice_cream_parlour_menu_card_template_psd865ex.pdfIn PDF document text
    • http://lastasked.com/41663166658ze4px.pdfIn PDF document text
    • http://wujasonuvilo.mywebcommunity.org/classifying_rational_numbers_foldable.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/biluzijumekof.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/organizing_quadrilaterals_worksheet_answers_mathbits.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/71b831e9-cbf9-4ab8-b09f-ffcdc04901d2/wizardry_1_windows_10_patch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a04295b-09f7-4273-bf3b-b19255e5e007/jibovejazotemip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47c0204-d7a0-442a-a4e5-32c1543a3933/geranuxapun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b568362-5351-48d4-b8b2-c3b7d0caed96/liftmaster_8365w-267_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf1871f-979b-49be-8077-bf4811f256db/67327909940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549848ad-d32e-4a25-af3c-f6cdd1e531de/english_words_list_with_meaning_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84324f75-bc0a-4b81-b0bb-820f782f719c/fozikojivotofes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d963fcda-10cf-481e-82f0-d2b62d5cdb51/frozen_musical_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b1a1d3-4327-45c7-82bb-4b4e6267cbce/leica_m6_ttl_0.58.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_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 5232 bytes
SHA-256: fd59b4091f541ac9eec4f7e7d965579fcd1d42c27512224accede0831638ccc2
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 5408 bytes
SHA-256: 788fe1855619ed5662df63bd119df91e0eab5e4c8c7951f844a6954010a9e1d7
font_02_sfnt_off000129d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 10368 bytes
SHA-256: 90a4f4d4ca15b1d1d79e2536ef64c6795881bac9ffc3e6fc26e0fb9e58521ba2