Malicious PDF — malware analysis report

Static analysis result for SHA-256 c454efe012091ecb…

MALICIOUS

PDF

73.5 KB Created: 2021-03-31 05:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 214cf353bf8ec8789004e85379cf14f1 SHA-1: 1dfa80b9d3938567234db91f589f805e8e001238 SHA-256: c454efe012091ecb1ab33852dcc8c519eb4ed06ef1022e29cc5c0a60119a49af
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a heuristic firing for a PDF link farm. The document body, though heavily obfuscated, suggests a lure related to 'present tense exercises pdf with answers'. The presence of numerous external links, including one to 'wapividazofar.scienceontheweb.net/papirejaxu.pdf', indicates a likely attempt to redirect users to malicious content or engage in SEO manipulation for phishing purposes. No scripts were extracted, but the overall structure and link farm heuristic point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/award?keyword=present+tense+exercises+pdf+with+answers PDF link annotation
    • http://wapividazofar.scienceontheweb.net/papirejaxu.pdfIn PDF document text
    • https://wituxilozixataw.weebly.com/uploads/1/3/5/3/135317309/7034057.pdfIn PDF document text
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/8602710.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/rizudubum.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/pokukitosave_rexun_gexegoworasunu_xabunopinukulat.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/9972586.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/the_lion_the_witch_and_the_wardrobe_series_movies.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/drown_junot_diaz_character_analysis.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/dabatisew/32636778953.pdfIn PDF document text
    • http://gulagopafed.onlinewebshop.net/behavioral_finance_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/14419187771.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/tefodikipuvivipemakar.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/are_danby_refrigerators_any_good.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/pyridine_alkaloids.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/stories_with_holes_amazon.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/zazepowegi.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/21186383961.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/belajar_saham_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/spider_man_into_spider_verse_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/37599249204.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/feversham_primary_school_ofsted_report.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/hp_laserjet_p3015_toner_55x.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/what_does_yes_sometimes_meaning_in_english.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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 5372 bytes
SHA-256: fd7f7f3878b969fb1bf5091989e156cb615acb30fa27fbf8a5154810ff333a92
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 10640 bytes
SHA-256: 4db4789a0c770f03d9fa5309b64daa8f72bcd00adc65d03f7501d9658d5f7872

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