Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8022a9200fd3e27…

MALICIOUS

PDF

73.1 KB Created: 2021-04-02 12:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 09866dd73ad27a5807074b67fb6c1379 SHA-1: 0524b408b009aa279859cb4493abb6047436048f SHA-256: a8022a9200fd3e27e1391c08d0730a657407cd41c4faf5bdcd295b1bad1dcbd5
156 Risk Score

Malware Insights

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

The PDF file, generated by wkhtmltopdf, contains a large number of external links, indicating a link farm or SEO spamming technique. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=how+to+truly+stop+smoking+naturally', suggests a lure related to health or self-improvement, while the heuristic 'PDF_SEO_LINK_FARM' confirms the presence of numerous links to other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://kuzutuzo.ru/strik?utm_term=how+to+truly+stop+smoking+naturally PDF link annotation
    • http://fuvimus.22web.org/philips_series_7000_beard_trimmer_replacement_heads.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/z_table_critical_value_calculator.pdfIn PDF document text
    • http://gisujug.mypressonline.com/categorical_syllogism_examples_with_answers.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/sekobugetiwomil.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/present_perfect_tense_mixed_exercises.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/44959768826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livibodake.rf.gd/kozujojabof.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/why_does_the_raven_only_say_nevermore.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/92366555831.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/candy_crush_jelly_saga_free.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/remington_arms_armorer_school_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/harry_potter_mini_book_covers_printable.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/29414838048.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/toyota_camry_xse_hybrid_2021_price.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/imperative_form_french_conjugation.pdfIn PDF document text
    • http://noserupoxor.rf.gd/sports_equipment_vocabulary_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/air_hogs_thunder_trax_charger_uk.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_df4df316858c4c51bc16cbf90df91883.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/9179615872.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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 5360 bytes
SHA-256: c2d6869fac2226ced1f76b7a48752e89053372c6c0317d5a6180b9bb25e740a7
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 11280 bytes
SHA-256: c154d1a054378beeb1d3dc9eef4d789920c511386cfd719f9b4b63a56e949378

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