Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bedc29395ce1ab3…

MALICIOUS

PDF

81.1 KB Created: 2021-05-18 06:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: baf737f17e641ab9d6f5e2f71a4058e3 SHA-1: e43ab6cf67395966b86f79d4c09f732c1ec0db83 SHA-256: 1bedc29395ce1ab3b67109993006db8642d45184375cd2e80f19ae1aa71739f5
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The 'ClickFix' heuristic indicates the document likely instructs the user to run a command, a common tactic for executing secondary payloads. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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/strik?utm_term=acrobat+reader+dc+windows+10+crash PDF link annotation
    • https://pimejowutaviju.weebly.com/uploads/1/3/4/4/134495028/f294a68a52.pdfIn PDF document text
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/9918353.pdfIn PDF document text
    • http://tejaxoxedagu.iblogger.org/24263071266.pdfIn PDF document text
    • https://fomimelagesuto.weebly.com/uploads/1/3/1/4/131406840/pibekatop.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/2832c50bdb43.pdfIn PDF document text
    • https://litudawugo.weebly.com/uploads/1/3/3/9/133997631/fokega.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/ff60d0ef-2940-4578-a0d9-cad445ef08ab/fuzezuwuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/arroceria_formentera_menu_del_dia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd62b0d0-de72-4611-a4a9-6f64ef88a9dc/personal_pronouns_exercises_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/bounce_unscented_dryer_sheets_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/this_is_disciplinary_literacy_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/how_to_clean_my_keurig_2.0_needle.pdfIn PDF document text
    • http://dadagax.epizy.com/modefum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb1b722-8696-4834-a5f4-65da4a1685a4/think_like_a_freak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ceeeda2-1c19-45f4-9b55-e13673247370/konejaketagitokinat.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/tisusokegujudoseratopibu.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/best_love_quotes_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/tu_pago_movil_banco_bicentenario_apk.pdfIn PDF document text
    • http://wodasakuzetu.rf.gd/autodesk_fusion_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401635a3-dd52-48b3-becd-d73fcf54e939/lookup_fedex_without_tracking_number.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/how_to_draw_an_isometric_view_in_autocad.pdfIn PDF document text
    • http://jojisoxig.epizy.com/5970817730.pdfIn PDF document text
    • http://merujepapi.epizy.com/avery_barcode_labels_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e03aa1c-7070-4113-85be-f76dcc77b6cd/14245800397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d039575c-38f8-4d9a-bcea-802bafdd1b2c/64154661521.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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 5412 bytes
SHA-256: ccbd4f1f28d6b0fcd6404f5fddd223c1710a518b1509c44bae727c429b16ebe3
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 11344 bytes
SHA-256: c430d52051d4b13514838262fb1ac0b50ad6981412bc9b779d2bd248bb26cc37

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