Malicious PDF — malware analysis report

Static analysis result for SHA-256 081ead8d5a3958a2…

MALICIOUS

PDF

72.5 KB Created: 2021-02-19 23:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42f41ca9a613849f2343c74128abaf41 SHA-1: 98f8d1c3643409b4380a3c9e684ff706da92662e SHA-256: 081ead8d5a3958a2c5e10c139faafbea8232175aaa43aaf1225621d4f2e7a499
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/strik?utm_term=how+to+fix+flickering+vizio+tv PDF link annotation
    • http://tufezoba.22web.org/63297595439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fded62e394e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_5fd97364e1748.pdfIn PDF document text
    • https://kexibisurek.weebly.com/uploads/1/3/4/3/134334279/4994446.pdfIn PDF document text
    • http://ganutaragifak.22web.org/ayushmann_khurrana_songs_free.pdfIn PDF document text
    • http://xewosaxebojufir.iblogger.org/can_you_sue_for_lying_about_paternity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5fee850a4fdfc.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/tinigerepiwosis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_601dc80fa7516.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/genukopapovixo/verizon_caller_name_id_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/long_i_words_with_silent_e_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/free_app_store_apk_for_android.pdfIn PDF document text
    • http://gexegufikide.epizy.com/why_is_my_contour_box_blinking_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/99108438471.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/94250858000.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/14034932640.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/level_99_fishing_guide_osrs.pdfIn PDF document text
    • http://gefuxuxoj.epizy.com/how_to_reset_adobe_after_effects_trial_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/jonanuxerojelefew.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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 4956 bytes
SHA-256: 7dc194fa41d2bf5841466efa956681198c7ecba8d02e7cab8c06d76707eb1ba3
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10952 bytes
SHA-256: 2422a421920fbb28f374296d86284dfde480613290e4c26e75476b5534708908

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