Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ba8757d3977856…

MALICIOUS

PDF

78.2 KB Created: 2021-04-02 13:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d31796aae09aedf93895a1b182eec0b7 SHA-1: c49caf93c3062f3cd818914db4c6be78f0d0bb52 SHA-256: 42ba8757d3977856a8c07a31bb502a2d72c64e92493573f41dc9b123fdd8a4dc
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds external URIs, with the primary one being a suspicious URL that likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'Facebook saved collections' and 'wkhtmltopdf', suggesting a lure to a malicious site.

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://pelibifir.ru/strik?utm_term=facebook+saved+collections+public PDF link annotation
    • http://catsism.com/fundamental_rights_in_constitution_of_nepal_2072_in_nepaliul7ph.pdfIn PDF document text
    • http://tamigome.scienceontheweb.net/aso_exam_syllabus_2020.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/595205.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/classifying_living_things_worksheet.pdfIn PDF document text
    • http://homebig.space/tadap_tadap_ke_mp3_song_downloadg2up1.pdfIn PDF document text
    • http://freefire-gifts.com/dd_cafe_menuvi0kk.pdfIn PDF document text
    • http://copyrightram.net/dj_turntable_mixer_freerpcah.pdfIn PDF document text
    • http://thedefenseforge.com/mental_status_exam_formge3ge.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/8815614.pdfIn PDF document text
    • http://verification-help.business/pancharatna_kritis_lyrics_with_swaratrkwf.pdfIn PDF document text
    • http://fruit-ital.space/2017_federal_w_4_withholding_formwlqe4.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/84ebb12ab4d.pdfIn PDF document text
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/3197746.pdfIn PDF document text
    • http://onlinetiser.website/dead_ever_after532zi.pdfIn PDF document text
    • https://tukojokub.weebly.com/uploads/1/3/4/5/134513360/6982222.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/bibejovixapis/ps_vita_slim_protective_case.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/71903667521.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/nose_bleeding_first_aid.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/giberelinas_en_plantas.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/coronary_ct_angiography_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/73769417966.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/galebakenoputupanofogu.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/70469887498.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/9980679377.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 5188 bytes
SHA-256: d2102e7871063e3e8b5763c4a5097c7d72eb4faa4e43b932c3b9a92bdfa9f9f5
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 11316 bytes
SHA-256: f5c43938f1becc80fff5b6bbdd687248d015554a7bb449af865d82dcae906397

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