Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd759775bef18651…

MALICIOUS

PDF

92.8 KB Created: 2021-03-25 01:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8ea0e4efbaf10d0497a7749b23c756d2 SHA-1: 510b14a613df3712e6264e2a207f426708f96333 SHA-256: bd759775bef186513f81f7ac27445efed73bc5bba1d89a413f18e28e3284ccde
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://zajinet.ru/award?keyword=calendario+escolar+2020+venezuela+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420588/normal_603c09b953a6a.pdfIn PDF document text
    • http://kotexob.iblogger.org/take_off_past_tense_form.pdfIn PDF document text
    • http://nusururak.22web.org/85603552171.pdfIn PDF document text
    • http://bajesiradevo.getenjoyment.net/powowisilufuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_6053bd94f2630.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/zovimipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_602ef504ebebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5fcee43f86fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_604acab24b3b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_60588befb552f.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/xufaxoferugod/citizen_eco_drive_watch_perpetual_calendar_wr200.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/zinaxumonipakevosunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58028fa-21cd-4974-b06d-69dd5fdfbf58/onkyo_tx-nr838_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356f915d-d681-421b-9801-b540f30e3224/sonic_large_tater_tots_with_cheese_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9e94d9-36cb-4075-8c91-b55986ce2c36/valilojega.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/advanced_english_grammar_class_7.pdfIn PDF document text
    • http://puteruwegadijem.epizy.com/hazard_analysis_critical_control_point_haccp.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/rimogagazozawor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 5360 bytes
SHA-256: e02512aa034e55c7e0c3f07a447813ba5c63b60dca9a023b7778a9536fbb4a30
font_01_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 12028 bytes
SHA-256: ed533e080f8d214381f172e7634f9e4d6e2f2ac3ae19a817ff50a6e06df42e23
font_02_sfnt_off00014021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14021 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off0001554f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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