Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06573da8576d8c5…

MALICIOUS

PDF

107.0 KB Created: 2021-03-21 23:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1ad14619d06e01db984c47e2b30ea66a SHA-1: 1f7f4a1d8500bc9657e5dea5971ff617e07e9ae9 SHA-256: e06573da8576d8c5b2cbdf03e897256401a98b7571f35842ddaf1d987cb34b24
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

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 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://maypoin.ru/wix?keyword=kapitel+1+lektion+1a+answers PDF link annotation
    • http://tesupelaj.sportsontheweb.net/probability_questions_and_answers_university.pdfIn PDF document text
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/rakuwiloxa.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/hp_laserjet_p1006_driver_is_unavailable.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/14857650304.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/bedebuta-foxumugoxakoxi-rosejorege-vaxarudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_600500d9ad1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_601149e0a1b39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461219/normal_6001012188560.pdfIn PDF document text
    • https://wariraxaluxar.weebly.com/uploads/1/3/3/9/133986847/ac682564faf.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/e8bcd.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/9e423b8075.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/advertising_and_brand_management_free_download.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/garorowa/whatsapp_transparente_apk_ultima_version_2018.pdfIn PDF document text
    • http://ruzofugeru.myartsonline.com/fipiput.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/lesson_2-5_solving_literal_equations_for_a_variable_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/wow_cataclysm_affliction_warlock_pvp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/russian_mink_lashes_near_me.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/does_honda_make_pressure_washers.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/figinuzexisetofiwelejivoj.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/nijozojexega.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_off00016445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16445 4992 bytes
SHA-256: 2578edb17bb1f7d2787840be5f77dfae3a44b5a7d5385a0a13106aefec2bfbe3
font_01_sfnt_off00017563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17563 12220 bytes
SHA-256: 638208b6b5f658446840ac4f44b6fa7541e901dea9a02b72798da7733eff6a5b

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