Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce77bef7d1013167…

MALICIOUS

PDF

84.3 KB Created: 2021-03-16 16:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4162f8051ac72c5c7a899511a8e03751 SHA-1: 347eee7fba108991bbb7524a8448fc1f25648996 SHA-256: ce77bef7d10131679554125419a0160544949fef34aa06819cc180384289dac5
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, as evidenced by the PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM firings. The embedded URLs, such as http://magazinrf.xyz/turagowasakemezufawotolabsfona.pdf, are suspicious and likely serve as lures or download locations for further malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://baarspo.ru/123?utm_term=change+date+format+in+php+using+strtotime PDF link annotation
    • http://rmk4sale.xyz/samsung_galaxy_note_30_ultra_pricesb2mh.pdfIn PDF document text
    • http://xenejesujotolud.mypressonline.com/how_to_fix_an_ice_maker_on_a_whirlpool_refrigerator.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/banishing_ritual_of_the_lesser_pentagram.pdfIn PDF document text
    • http://organic-ita.space/wogajuloru8m7e5.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/88930506481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_6031d910909ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_601fc84dbc363.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/62998695178.pdfIn PDF document text
    • http://appletopshop.ru/is_allegiant_giving_refunds_for_covid-19mc7ue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_602fc6559b129.pdfIn PDF document text
    • http://magazinrf.xyz/turagowasakemezufawotolabsfona.pdfIn PDF document text
    • http://redita.fun/my_beloved_crowder_chordslryti.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/much_ado_about_nothing_summary_video.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/eb9cf5d7-59c9-4906-be7b-1aa90d93de05/50092282302.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/tulajolinojonusi.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/zorafojufirukewes.pdfIn PDF document text
    • http://setovoj.onlinewebshop.net/93342969164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8010476-d71d-435a-b4ce-046e0b82b3e0/57760950479.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/nifiditefumodizigof.pdfIn PDF document text
    • http://pigutun.myartsonline.com/associer_deux_page.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/mukunolobozorovelemapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bd359e-3644-4640-b113-3955a2c5cbef/how_to_map_a_run_on_map_my_run_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/poxibidopodutevufevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764ad699-08d8-459e-b3d6-dbd44eafc8b7/lonely_planet_india_travel_guide_free_download.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_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 5328 bytes
SHA-256: ebaef236099c5686d33557a346cc8eaeb621d50afa464d2b946a635110393e65
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 16796 bytes
SHA-256: 30d180cc3a1ed3d8fbac7b638d43deabb6f6dc7d5d18d74bf946b7c3e0e1156a