Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bbc4bebaeaf3f1…

MALICIOUS

PDF

87.1 KB Created: 2021-03-30 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8fe523fd84ecd2502809d26f33cac2d5 SHA-1: 2547d59e26679811c77008e3cdda6ff0c5a2f726 SHA-256: c7bbc4bebaeaf3f15b18bd3add4ee82319e3fc92e0513995ece2a87575812e43
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, and the presence of a URL with a search query term implies a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=what+do+word+formatting+marks+mean PDF link annotation
    • http://rodisawikikofu.medianewsonline.com/kilaligebadugujat.pdfIn PDF document text
    • https://xoramudoxuxuxo.weebly.com/uploads/1/3/4/4/134471846/tolewofavuvaviji.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/tigorezeda.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/fusionner_mac_os_x.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/saguna.pdfIn PDF document text
    • http://baboguzaxeleju.mypressonline.com/29715832654.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/c_v_format_for_job_application.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/barron_s_toeic_6th_edition_free.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/metallica_one_tab_download.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/pisizafubapediz.pdfIn PDF document text
    • https://bepikirutufuw.weebly.com/uploads/1/3/4/8/134866592/4624840.pdfIn PDF document text
    • http://bagururidafu.22web.org/bullseye_glass_catalog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/organic_chemistry_notes_class_11_free_download.pdfIn PDF document text
    • http://dajaxul.epizy.com/dish_network_satellite_tv_for_rv.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/zavenezekejatinifasadeli.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/coordinate_plane_picture_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b6cc63-07d0-45c1-9936-45bffa00a659/do_ego_lawn_mowers_go_on_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/59449463379.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/diagram_templates_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ae408e-1335-4b9b-be7e-eaf0753c3c71/which_roku_is_best_for_hulu_live.pdfIn PDF document text
    • http://kemixirutuj.epizy.com/fikovu.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/mbbs_books_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b04b2a-76ec-4f81-806c-9ce0c324c5d9/kenmore_gas_range_oven_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/why_does_ff7_remake_have_2_discs.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/tulalupetugeta.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_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 5460 bytes
SHA-256: 5be6e86d921ea9b92d11fc1f4d30c1d8534160a2ef5bb263ef87d31118ad25cf
font_01_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 10912 bytes
SHA-256: bd0ca9963092c1f1a1d0b4edb6ee2985de2126620f56d8909490d921b95446df