Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f1d12366f5126b…

MALICIOUS

PDF

82.9 KB Created: 2021-04-04 08:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3d0e0c780203ae244fa21eecd3997846 SHA-1: d92cc9674fe2ca2080921cffaead0a58a136d741 SHA-256: a5f1d12366f5126b10ed67310234d85f734bbee12e774254e929c569ca041fc7
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on potentially untrustworthy domains. No scripts were extracted, but the presence of external URIs and the ML/AV detections strongly suggest a malicious intent 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/award?keyword=anterior+shoulder+dislocation+protocol+pdf PDF link annotation
    • http://sexugaweguko.iblogger.org/ninuxikemubokelasuna.pdfIn PDF document text
    • http://prostosite.site/toyota_kluger_rear_seat_entertainment_system2mzkj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_603877864e869.pdfIn PDF document text
    • http://alex-chekalev.com/an_organizations_information_technology_project_selection_process_should_guide_the_strategic_plan4udxg.pdfIn PDF document text
    • http://biomaniks.website/87423652129x66mi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_5fe1761f236f4.pdfIn PDF document text
    • http://parrrtner.xyz/besivugubopubetovijosfjset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_5fd6d820472d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6053135ac6f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_60321fd16e636.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/avast_secureline_vpn_mac.pdfIn PDF document text
    • http://goromeo.club/python_classification_report_confusion_matrix5hg1v.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/6e91700d-f5d2-4782-a3b9-54dc8f002a99/4967372218.pdfIn PDF document text
    • http://xovogig.epizy.com/fewozowujo.pdfIn PDF document text
    • http://laropijodozu.epizy.com/badagidodetemolekadepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19739b0-5c50-4831-bef3-aa4642bd24b2/jiwozezap.pdfIn PDF document text
    • http://zirofasorajama.epizy.com/bsc_sem_1_chemistry_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98c77c7-c879-449d-9697-6164775db7b3/bumebimutudexuxugad.pdfIn PDF document text
    • http://mamawelujuke.rf.gd/kumajazuwaronat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d9f440-653a-402a-911a-fb829548fed7/tabela_de_frequncia_estatstica_exerccios_resolvidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59814f84-5d1f-4c0f-aca7-3428d58e5f7f/56240944352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3a65c1-6278-4691-9f0c-841f522fba88/dubirupulixiwexuwakuxij.pdfIn PDF document text
    • http://zosutifajo.rf.gd/funitikoxoxigek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5a00cc-d87c-4843-bdab-d2be0eec86ed/how_do_i_reset_my_logitech_k380_keyboard.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_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 5232 bytes
SHA-256: 4822dde4da27668396ee8c11e123cd59fc5c4c70c83d1472a17abd253ebe9361
font_01_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 11100 bytes
SHA-256: e4d1127d3a859965022847cdb44b42daf2513b942a71c66484dfa37bc84904bd