Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae93e2d2c9cf705…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 12:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff3cfa92cf7fca3ed7e8813ea3583869 SHA-1: 83b89d48dadee508e7bbc7b57e294eb60659b487 SHA-256: cae93e2d2c9cf705e6e9aff13e6da71c216228691966eea6add57e12b76a0d43
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The heuristic firings indicate this PDF is a link farm designed to direct users to external malicious content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=film+trailer+houses In PDF document text
    • https://vomadepuxu.weebly.com/uploads/1/3/4/7/134700608/f1b3b4040733.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/aheifhf/28106475296.pdfIn PDF document text
    • https://cdn.sqhk.co/wudarivat/g2mVbgj/triblive_best_of_the_best_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/gjgtDjd/68750753339.pdfIn PDF document text
    • http://safilow.iblogger.org/word_english_spell_check.pdfIn PDF document text
    • https://cdn.sqhk.co/vetejevibas/ozifNii/bedaxakejorividewuzil.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/5536ea1.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/2855a74f.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/Mdjaiij/driftwood_christmas_tree_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/ibChgbw/minecraft_news_server.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jg0icqP/1657536743.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/6XQpSyO/find_my_friends_location_will_not_update.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/a_line_formal_black_dress.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/android_17_name.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/44175232728.pdfIn PDF document text
    • http://tapanowi.epizy.com/graphs_library_android.pdfIn PDF document text
    • http://gebutetivifupa.epizy.com/daily_todo_list_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/american_pie_sheet_music.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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 4880 bytes
SHA-256: 28b97c447cf4f7367a576f25023983d220d61620824650a70d0db41704112983
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10084 bytes
SHA-256: f0ebfd74573df7875d4488c2b81519e1ff6cee794c2f1139f744d6574c96447a

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