Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b775999cb4d052…

MALICIOUS

PDF

99.1 KB Created: 2021-03-20 23:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b48163a2506b706a7c4146158a62d3a SHA-1: c949d84e689e6c6b9c7f8ad0c0b25679cdbef8e4 SHA-256: 24b775999cb4d0521e3f11e8298b02e082306a18e98f4ddc3bde8036af584fc8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL distribution are indicative of a link farm designed to redirect users to harmful 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://ponafet.ru/wix?keyword=teclado+de+computadora+simbolos PDF link annotation
    • http://carbags.site/80806527901vq66l.pdfIn PDF document text
    • http://copyright-notice-ig.com/bumipurmd6gr.pdfIn PDF document text
    • http://fortuneo.biz/speed_moto_racing_city_edt_mod_apkxh6bi.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/4giiejj/5564584306.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/film_genres_list.pdfIn PDF document text
    • https://cdn.sqhk.co/batitiviz/he8pGel/highway_55_idaho_accident.pdfIn PDF document text
    • http://wusator.mygamesonline.org/free_asvab_study_guide_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/gfTMsm1/boris_and_the_dark_survival_apk_free_download.pdfIn PDF document text
    • http://unonatur.space/fitbit_inspire_2_clipmu2bj.pdfIn PDF document text
    • http://kzrovk.xyz/974118679705mowr.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/mawapune.pdfIn PDF document text
    • https://cdn.sqhk.co/winexumalov/idialjb/77152219479.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/sijubome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipazafar.atwebpages.com/nosimudubulifemom.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/blank_warranty_deed_form_georgia.pdfIn PDF document text
    • http://mexorilurolepap.rf.gd/medical_terminology_basics_haspi_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f91e68-4ac8-4de6-bed5-537550b4556c/26471351962.pdfIn PDF document text
    • http://zekutevig.rf.gd/goat_simulator_all_trophies_goat_city_bay_ps4.pdfIn PDF document text
    • http://zusewijoje.epizy.com/abolitionist_movement_in_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d826ba-a9dd-4185-b031-ca5cb0c5d959/zaxofajodowunemul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a369e402-22d4-4681-b782-d312b5d994d5/20529870971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ccd8448-0ee8-4120-99e5-17c2244a1e47/8733369270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb4b6cb-d8a5-40f7-8ddb-0b29a149cb58/48164421191.pdfIn PDF document text
    • http://guwajogijifode.rf.gd/74092230771.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_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 5308 bytes
SHA-256: 7b2bd28ef1ef4370651a317b8fb4c8a22ff79d1ed060bc6de7c0fae6d98566fe
font_01_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 34172 bytes
SHA-256: c16f2261b37e8f5b2edd8c6095b963a2f22fdf8af0b4c0b496436c05c2311ada