Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2f61c4ff347322…

MALICIOUS

PDF

74.0 KB Created: 2021-03-29 14:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc68aee22c6fb287651a8093d2bb0c87 SHA-1: 9230f338739319732930bbcce3807a89c8d77a06 SHA-256: 2f2f61c4ff347322777b02e02039150a8daf1a5285545a0e29fcbdb6a8e266c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link leading to a URL that mimics a search query for educational content. This suggests a tactic to attract users under the guise of providing information. The presence of a large number of PDF links, including one pointing to a potentially malicious file on AWS S3, indicates a link farm or distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/wix?keyword=2017+ap+biology+free+response+answers+question+7
    • https://cdn-cms.f-static.net/uploads/4366400/normal_604ae400c8e44.pdf
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5fee986b13f6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/debamijizozexo/fuxuvuvubulufe.pdf
    • https://s3.amazonaws.com/niporofez/chokra_jawan_re_song_mr_jatt.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_aab4abe5708a4d919242570eaeb67dcc.pdf?index=true
    • https://s3.amazonaws.com/sepawi/sample_business_letter_format_with_cc.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_d513080b02f74902ae9dc6cf68420202.pdf?index=true
    • https://s3.amazonaws.com/xazarujokemus/vawojoviwinilelapireg.pdf
    • https://s3.amazonaws.com/muxozuvalubi/propaganda_bernays_franais.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/walmart_hours_omaha_nebraska.pdf
    • https://s3.amazonaws.com/xalasawu/tetup.pdf
    • https://s3.amazonaws.com/bogeguva/backtrack_5r3_apk.pdf
    • https://s3.amazonaws.com/vuxirefare/porter_cable_pancake_compressor_regulator_repair.pdf
    • http://mepalobes.rf.gd/bible_verses_about_healing_sickness.pdf
    • https://s3.amazonaws.com/bisiku/444935090.pdf
    • http://nupopejif.epizy.com/ignition_scada_manual.pdf
    • https://s3.amazonaws.com/pulujolatepuv/bbc_news_app_crashing_on_android.pdf
    • https://s3.amazonaws.com/baxunaf/sqlite_data_types_date_android.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_off0000e127.bin
3170f44f2759a64f328f9084cb8ed00d54daed7fe3906374b6ae9f8dd135dedd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 5840 bytes
font_01_sfnt_off0000f539.bin
263bca2f4eb010d470821eadcf7df0583e03186cfead6fe6ccdf6feb1ee6d109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10632 bytes

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