Malicious PDF — malware analysis report

Static analysis result for SHA-256 212687812bbdbec2…

MALICIOUS

PDF

73.7 KB Created: 2021-03-24 17:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9abc7a440cd731c31e24b38f561468da SHA-1: 1dd528821bd420fc02c56e6f47786430d846559e SHA-256: 212687812bbdbec2dec09e52222b1ad08ef6e2be154e64a06d03fac0326e5f9e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links point towards an attempt to exploit users through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=sony+rx100+vii+accessories+uk PDF link annotation
    • http://tewapakug.22web.org/effective_classroom_management_techniques.pdfIn PDF document text
    • http://getchambre.xyz/how_to_fix_cuckoo_clock_weightscuafg.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/eureka_easy_clean_71b_target1e4bf.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/tijafevade.pdfIn PDF document text
    • http://lerevujoda.iblogger.org/balance_sheet_investopedia.pdfIn PDF document text
    • http://otomail.business/38505320191qx97q.pdfIn PDF document text
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/gozegup.pdfIn PDF document text
    • http://bachanalytics.com/pilusuvobasaqowo.pdfIn PDF document text
    • https://setozovijigaze.weebly.com/uploads/1/3/4/3/134383391/dazamezegerere-losijabeped-fonikasom-pevofigabilo.pdfIn PDF document text
    • http://cucoupon.info/30660315782n8d1t.pdfIn PDF document text
    • http://shop-kid-toys.online/camera_lucida_app_for_android_phoneydh5w.pdfIn PDF document text
    • http://conicppjry.bid/how_to_heal_acl_surgery_fast5jb3v.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/6f9b3672-9282-45c1-91d6-86bc7e738654/ultimate_ears_boom_3_waterproof_bluetooth_wireless_speaker_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bcc776-4e48-4de0-977a-fb9599cb00c2/2061416930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e49f453-3fc8-4939-8e03-ca31d7fa450f/xibexigemukisikuliwafuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b331d7dd-f974-4ad7-99e5-cae838188e51/cycling_merit_badge_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db29cb8f-85d4-4b63-90c4-3ec75ade0a79/45333169625.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/brahmins_gotras_list_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a65ad5-8226-46ee-beb2-bdaa2db5d2f0/29974729761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce0c33e-b297-4e5f-b5aa-c43c1f9ebf48/37052578489.pdfIn PDF document text
    • http://dugipiwem.epizy.com/54305730098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f21bcb-ece6-4b69-9833-eda2ecbb0d31/why_are_partnerships_important_in_education.pdfIn PDF document text
    • http://rafesule.rf.gd/fictitious_business_name_statement_renewal_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdbe66a-acec-4e22-9b08-93aca58089e8/bebekagunatekamogijesamuj.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 5352 bytes
SHA-256: fc0803d41da2daa1ad3f893f99f363deb98686d6681e5061c0ee7341795f057a
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 11004 bytes
SHA-256: 7e8f7b24a3b4f0d929f92468e0ffe14b70d020009b7ce862780fc1eefd9f2443