Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ba5d79b710fe76…

MALICIOUS

PDF

82.2 KB Created: 2021-05-22 12:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a596608555f1294c73d5f04801a2171e SHA-1: 2664f2dfdbff164a3815966a0a57a40edfe732c3 SHA-256: 03ba5d79b710fe7653f97f1ecc32b4ba389714fff7da92330fd93800e189ac3e
156 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to Weebly-hosted PDFs, suggests a link farm or redirection mechanism designed to distribute further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, aligning with the file's metadata and indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=angina+pectoris+ppt+free+download PDF link annotation
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/sejadapu.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/lupaxed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_6040bfeb23817.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/9939925.pdfIn PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/5b8379dcfeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_605a711e595a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_5ff713283ddfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446634/normal_5fec92a9a39b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5fe02a3b2c047.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/vezuwamowax-dirafufali-jivojokulakevu-fukijuretij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_600016d1ce5ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_6002e2b1dfcd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_6027c06668996.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/xoferuzu/what_is_the_main_theme_of_the_play_the_importance_of_being_earnest_brainly.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/zetilezigut.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/paul_foster_case_esoteric_keys_of_alchemy.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/findings_and_recommendations_internship_report.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/jedevutevanumizupatat.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/pixewumup.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/ziguvon.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/19631502690.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/is_canon_mx922_compatible_with_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/petafesena.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/map_of_greenland_ice_sheet.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_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 5404 bytes
SHA-256: 30dab38fe5df879709f61b1c9f0ecdd432667a64ed9842fabdd7d480c2f34845
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 11004 bytes
SHA-256: 9472d99f8d1cff338f6d7970ac5bc4018f5505b4d381c88b1ad03581ebc52f42

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