Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a32bcb792d5a04…

MALICIOUS

PDF

89.2 KB Created: 2021-04-16 19:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 36b3ea09226db2ecdcb6ee822914a6f5 SHA-1: ab84ce76b537012615ef0d22b003c794374d9194 SHA-256: e2a32bcb792d5a04577c731e9b7cbab9fbc5c0f37928d8521a4ffb5b0885eec3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=life+application+study+bible+kjv+free+download In PDF document text
    • http://pujipaxubeko.22web.org/arihant_banking_awareness_book_free_download_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ff143fc8e717.pdfIn PDF document text
    • http://jelabenix.22web.org/ivabradine_heart_failure_guidelines.pdfIn PDF document text
    • http://samewejasaka.iblogger.org/71784684976.pdfIn PDF document text
    • http://rulerezimatot.22web.org/sumefizuwipevafijat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6023f19d1001d.pdfIn PDF document text
    • http://ponarolo.22web.org/directors_report_format_for_opc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fefe08819d21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457848/normal_5fecf0f62db45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xoxaneral/tunnel_engineering_handbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88581637-5f35-41b0-8573-3d7fe25de0d7/doterra_price_per_drop_canada_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0f5293-f038-4a14-b867-9fa4d9fbf749/all_souls_day_spanish_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/15234172429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb850b20-7842-46c9-97a9-cdfc02c81197/pirimifikojomuwobozot.pdfIn PDF document text
    • http://xekaguviratavu.epizy.com/47639061481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2691fe-c77a-4142-a596-dc8b28b567e5/how_to_scan_from_canon_pixma_printer_to_computer.pdfIn PDF document text
    • http://widaliwadon.epizy.com/basketball_court_size.pdfIn PDF document text
    • http://wepirizifomonij.epizy.com/berliner_platz_2_neu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d6ea6d-93ac-4c66-8d33-6fa815a69341/rca_10.1_2in1_tablet_reviews.pdfIn PDF document text
    • http://nozabikuj.rf.gd/data_science_degree_requirements_purdue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9fb72e-6845-4d5a-9a36-dfaed0541791/tobivegal.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/sazuwoxabisuwuwuverakis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 5504 bytes
SHA-256: 748e6ca5b56d17a71d13f7ffd6fe8ddcc708c36c75e798b71b5761758cf92f47
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 1956 bytes
SHA-256: 7c04bd7deeb11cdf7478c5ef593735c7fc22ac6759f279761b1d90d503580837
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 12144 bytes
SHA-256: d2bfaa80d1fbc91cfeb2ab1a2662ec5454069fbbeb957513482b019540b6d2a2
font_03_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b
font_04_sfnt_off0001462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f