Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d5325d192947f5…

MALICIOUS

PDF

81.4 KB Created: 2021-03-14 18:29:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4d4ee28185049792e50101b8ed22b5b7 SHA-1: 7bcd14e51cc78561bf7f463f9a93cbc000b7c586 SHA-256: a3d5325d192947f5730043c596617a63b2c5cba85e24a9232d6a86236db6da91
134 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL 'https://leonvi.ru/wix?keyword=cfisd+graduation+2020' suggests a potential phishing lure related to graduation information. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=cfisd+graduation+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474218/normal_602696f4a0d3f.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/94645621045zuouy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fc6da1ff09d7.pdfIn PDF document text
    • http://bu-markett.com/como_buscar_mi_android_robadohnrzl.pdfIn PDF document text
    • http://idealicait.website/kerofowukeu42oa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_602e42621023a.pdfIn PDF document text
    • http://myfavoritesun.xyz/72777570717snr0y.pdfIn PDF document text
    • http://snt-br.ru/mebojazabebibivusifetaa6ler.pdfIn PDF document text
    • http://slmit.fun/blood_gas_analysis_normal_rangerecpv.pdfIn PDF document text
    • http://keysecret.ru/best_app_for_instagram_stories_android8zvvk.pdfIn PDF document text
    • http://afracheat7.xyz/astronomy_career_informationytjhh.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/juwifojazamebewawemozuggnpk6.pdfIn PDF document text
    • http://4338bacchus.com/coleman_powermate_6875_owners_manualffewz.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/623a17a5-cbc1-4c2b-90ce-f92bcfc3e2ab/56691328269.pdfIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_c5a05ff160854feab6e821f7e7f03607.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_7553bc8b992849608d26f337050bcf80.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_a627d88c42514b37962c8a3d755ceb25.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_416fc8d07968429ba074a3725204f28b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca56347-9c4f-4963-93fc-b3bf7919f32b/47445449056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a35958d-0d64-4847-8f7a-55f24a212f06/ping_pong_workshop_london.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7667e7ef-64b8-4c83-9506-f6c59c0b0827/vocabulary_workshop_level_b_unit_10_answers_antonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea8b9a2-581d-4ed6-a5ec-29a087eb30e4/pusafeviposegore.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_20d0a668c5d6489c824b1b5431b334ac.pdf?index=trueIn 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_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 5220 bytes
SHA-256: 6a9a197b5188400d77fd4376ae5dd1559b65c7a0c918b0668a5f32795c522260
font_01_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 11556 bytes
SHA-256: ea0f1eeb8b54de1b61f2c4e64c5f21174a2fdad4db7aef5592257e2266d0f6d5