Malicious PDF — malware analysis report

Static analysis result for SHA-256 1916a7097560e1fa…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 17:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1c472f673bcf1b608ce47c0a27862373 SHA-1: 6ea983eaa911ad457e820446fbcf723394bf0f95 SHA-256: 1916a7097560e1fa724678a9ac8fc804b0ee26c88755880b8f6465cf5dcce3d3
144 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains invisible links pointing to suspicious domains, one of which hosts another PDF, suggesting a multi-stage download. The presence of external URIs and a visual download lure further supports a phishing attack pattern.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/123?utm_term=aktu+date+sheet+odd+sem PDF link annotation
    • http://jonebukusopovet.mygamesonline.org/how_to_identify_safety_issues_in_the_workplace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ffd261080dcf.pdfIn PDF document text
    • http://zokumujanuni.iblogger.org/what_is_a_working_memory_in_psychology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_6006e2866dab5.pdfIn PDF document text
    • http://expressday.online/sketchup_vray_lightingz8ll6.pdfIn PDF document text
    • http://dikebar.22web.org/appendix_in_research_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_60175f3f6f437.pdfIn PDF document text
    • http://chambrehub.xyz/waxogokavmwez9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fcdd3d031235.pdfIn PDF document text
    • http://serarudipiwuvon.mypressonline.com/tenexavu.pdfIn PDF document text
    • http://bonboxstudio.com/155343746686dd2f.pdfIn PDF document text
    • http://minuzin.22web.org/2013_acc_aha_cholesterol_guidelines_risk_calculator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477376/normal_600539da05e4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5fefc577779c9.pdfIn PDF document text
    • http://koreatop.ru/2010_ss_camaro_hp_for_salersvfw.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/logitech_mk710_review_cnet.pdfIn PDF document text
    • http://qupieasy.online/dan_brown_origin_audiobook_free_download7d8bm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_60073ef58bac6.pdfIn PDF document text
    • http://urologo.store/how_to_use_teeter_p2_back_stretcher2307g.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/docker_deep_divei0yqs.pdfIn PDF document text
    • http://avto-document.site/java_1._7._0_64_bitw6dyh.pdfIn PDF document text
    • http://5dradio.ru/4303741479zxxyg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexefobixavater.myartsonline.com/nate_the_great_goes_undercover_guided_reading_level.pdfIn PDF document text
    • http://jijeledinevo.rf.gd/sap_tcodes_for_ap.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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 4992 bytes
SHA-256: 91515bdd228db710fa7994a6b4a314bc55dcb150f48703e3d8fbcbf37fdedeb1
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10540 bytes
SHA-256: f99189961305577ff5bc968ace5fde22dd7ed5337f26659b061d30c362fe8dd6

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