Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bef85904c9fe123…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 21:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9439dd56a365d2c7194a9fa79f793eea SHA-1: 95188fdcd086225aae23f2f678146085a91cc2bf SHA-256: 9bef85904c9fe1235836d061360b185573c8edfdf083f6aeb73682c22d1e288f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=vet+tech+programs+ontario+colleges PDF link annotation
    • https://cdn.sqhk.co/zinumazak/jexia3C/acrobat_reader_software_free_9.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/2hhjiht/vebopoxejib.pdfIn PDF document text
    • http://leyloften.online/85186380633cseu2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://volazanuva.22web.org/63249046360.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/m665Op9/irregularity_report_act.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/eigdMjg/keep_talking_and_nobody_explodes_free_download_windows.pdfIn PDF document text
    • http://duxeluwezix.iblogger.org/xikevipad.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/hjv8IRs/duwalunibajemufetileloko.pdfIn PDF document text
    • http://copyright-supporthelp.com/what_is_the_best_cuisinart_griddler_to_buy01chc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwimusef.epizy.com/tigal.pdfIn PDF document text
    • http://joxumokuri.epizy.com/cloud_computing_ppt_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/formal_resignation_letter_envelope.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/85394946898.pdfIn PDF document text
    • http://zesufes.epizy.com/boardman_cx_comp_size_guide.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_8a00a5b186894fc898cac57bb1525a54.pdf?index=trueIn PDF document text
    • http://tonuvewogi.rf.gd/9260881325.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/91712426691.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/90597250322.pdfIn PDF document text
    • http://morejimolod.rf.gd/rajesh_bardale_download.pdfIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_1c0f72f172cc4d40862be20ca274c157.pdf?index=trueIn PDF document text
    • http://dorenibe.rf.gd/nopujuzifajewulitewadevag.pdfIn PDF document text
    • http://duzunop.rf.gd/simple_past_and_present_perfect_practice.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_2804778d01b44425b948e25660e9d4b4.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 5312 bytes
SHA-256: ef915d4dece100ad21a4b34b20c1c329a8a22da127342c41bef44921f0807c75
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10692 bytes
SHA-256: c0eff66384099ec23cacc6a73041bbc8847e2f81f1a422d26db8e1bd73205281

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