Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36e23eb4f8d36ee…

MALICIOUS

PDF

77.3 KB Created: 2021-05-03 19:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98e84dd33e5739e9f382d1684e9330c5 SHA-1: 5f10c7c50d691ff221067e1dceca77ca24838302 SHA-256: a36e23eb4f8d36ee32cdbd0a086ddcf346d73aa9f7dbda14a7794fea4693c2a7
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 0.9998

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
  • 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=does+walmart+carry+landline+phones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422385/normal_5ff658f616675.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/bxIoPBa/minecraft_skyblock_server_ip_1._14._4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5ff23a7dd77c5.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/djdjcvh/liribapijilasagip.pdfIn PDF document text
    • https://cdn.sqhk.co/mifebemige/dlAtjf2/zajevukizepukodafeloz.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/jcjbObp/prank_sound_effects_download.pdfIn PDF document text
    • http://nasty666.space/529101443963m8x7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_60225d1f4eb5a.pdfIn PDF document text
    • http://bowabemolova.22web.org/lesiponorulute.pdfIn PDF document text
    • http://damvglaz0.xyz/filmywap._com-_filmywap_bollywood_movies_latest_bollywoodkbswv.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/figiehd/fonevadopeluzevofalazum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_602164577c6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_60190e9f7f683.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/cWjePge/dragon_warhammer_osrs_fandom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_606c1512153c8.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/TrPQjbX/30243645734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalowakudedakov.rf.gd/noughts_and_crosses_template.pdfIn PDF document text
    • http://xesidif.epizy.com/python_download_files_from_web_directory.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_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 5504 bytes
SHA-256: e8123721e8ddbe60795ef87608714804ec28f5782988621dd6f833454d37d1aa
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10388 bytes
SHA-256: d9a880ee97bf8ee7752600a5e7c52beb7354a6905fcf1c5f2eb35c75efc69807

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