Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9327424c6afab9…

MALICIOUS

PDF

71.5 KB Created: 2021-02-26 04:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a79b7e5809406c82ad12c329a0956df2 SHA-1: 80aa31c270537181af386f12f65129c1ed06422d SHA-256: ae9327424c6afab9f35f0d3cd44687dcfd31b27552cba6f1951aa9927355ab9c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to technical instructions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

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
  • 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://crophysi.ru/strik?utm_term=how+to+install+a+rheem+50+gallon+electric+water+heater In PDF document text
    • https://cdn.sqhk.co/jafiwimeg/6WuI7id/55816982236.pdfIn PDF document text
    • http://sokfresh.fun/video_maker_app_free_download_apkptqtc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff0413f3e837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_601ff5b8a8bf7.pdfIn PDF document text
    • http://zuluwana.iblogger.org/thamballapalle_weather_report_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6034cf95d2b47.pdfIn PDF document text
    • http://datab.vip/the_history_of_hindu_chemistry_book_kisne_likhibu5uk.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/lJphiii/zukorojanapoxolejizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_602a35077f6af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_5ff6b4550b56b.pdfIn PDF document text
    • http://love-your-lips.online/21021722557pmf7k.pdfIn PDF document text
    • http://worldworkbook.com/league_of_legends_patch_10.23_downloadoflfd.pdfIn PDF document text
    • http://gimogorox.22web.org/ownership_and_encumbrance_report_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/hdgiljh/marvel_infinity_stones_mcu.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/ijrjjmA/jukatazijimawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojuwuwa.rf.gd/percy_jackson_and_the_lightning_thief_free.pdfIn PDF document text
    • http://jifusewu.epizy.com/rudiwigojepemosodizi.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/94536942876.pdfIn PDF document text
    • http://sosurovupek.epizy.com/75570996025.pdfIn PDF document text
    • http://rawatakutuju.rf.gd/oxygen_not_included_steam_guides.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/26303067077.pdfIn PDF document text
    • http://pirarotuweze.rf.gd/30731302959.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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 5532 bytes
SHA-256: 9bae8f53ca013fe89e7411d2693e968ce65d332add6c38906d137d602ff2b753
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 10272 bytes
SHA-256: 21d567464e858ff11458802523397ee50ae3e67ecc51bcca641db979fde3b8b5

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