Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace0990f2ecdfea2…

MALICIOUS

PDF

94.2 KB Created: 2021-05-09 06:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b996248ec737729167bf5a2909e3ab9 SHA-1: 36f32c10dc0f14561d6f11356fe8ecdb44892eb6 SHA-256: ace0990f2ecdfea236e1327646769040924a098714054a260ccf871d329e93b6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://seumenha.ru/strik?utm_term=is+ipad+suitable+for+university+student', suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=is+ipad+suitable+for+university+student
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/fosexipami.pdf
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/f8941b6169.pdf
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/98c22c0a3eae.pdf
    • http://molexepoleku.22web.org/udemy_python_for_data_science_and_machine_learning_bootcamp_git.ir.pdf
    • https://fifurinirolegif.weebly.com/uploads/1/3/5/3/135306558/rixuvuxaridezos-siremusilunos.pdf
    • http://nezidilaginu.iblogger.org/93336894027.pdf
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/dekera.pdf
    • http://nuzovofevaduw.22web.org/in_rebt_caring_too_much_about_what_others_think_is_frequently_associated_with.pdf
    • http://tolisona.iblogger.org/catia_composer.pdf
    • https://zupeloniz.weebly.com/uploads/1/3/4/0/134018773/536bd.pdf
    • http://dobewobezusisof.iblogger.org/2029544129.pdf
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/884a8.pdf
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/04e6a12acc.pdf
    • https://dizalojowu.weebly.com/uploads/1/3/4/8/134866254/jeladedatubefop-nivutakasogozis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://leribilif.rf.gd/4146978777.pdf
    • http://nuvavevuk.rf.gd/xisipisaxixolinerapuxet.pdf
    • https://s3.amazonaws.com/liwafo/38941528751.pdf
    • https://s3.amazonaws.com/wusone/where_to_buy_a_ds_lite.pdf
    • https://s3.amazonaws.com/fevobelijogal/information_technology_intermediary_guidelines_2011.pdf
    • https://s3.amazonaws.com/temujonuwu/sizasizupigokefuzu.pdf
    • https://s3.amazonaws.com/somamere/compound_sentences_worksheet_with_answer_key.pdf
    • http://banidokote.epizy.com/95571040032.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001306f.bin
aa75aa4d6c9246fefd9dedb7583bc6d5ef12d57fe96d4d420826604e02a7cfd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 5276 bytes
font_01_sfnt_off00014273.bin
62ae813710171ea68f0c5e4db612bd603598116b8b6793d5261fdbe34c1df677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 11868 bytes

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