Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc56b91a77104e25…

MALICIOUS

PDF

71.5 KB Created: 2021-02-09 00:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5307ed50fa4df07278e597401da94eba SHA-1: 65683de0f008142a4fba773989643a647df5b89f SHA-256: dc56b91a77104e251a83bc1c09fa6ee33469b0d2fa0f5e9b9f28095d52b8d66e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one prominent URL pointing to 'jacksth.ru', suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, including one flagged as a potential SEO link farm, strongly suggest an attempt to direct users to malicious content or phishing sites.

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://jacksth.ru/aws?utm_term=america%2527+s+army+2+game+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426832/normal_6005d624426f6.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/ihNGWgd/jovidijuxulazobemopuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5ff8621678716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488349/normal_5fd1fb0e4193b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fcfac776ddc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5fed6634accde.pdfIn PDF document text
    • http://libralab.digital/getty_images_pricing_ukjty7r.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/chheZia/zuxogurilifexoperekos.pdfIn PDF document text
    • http://idealslimitalia-official.site/gikapamij2a8.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/jovol.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jgha1je/lyft_driver_app_support.pdfIn PDF document text
    • http://fruitik.space/74560644572y0637.pdfIn PDF document text
    • https://pefeluleno.weebly.com/uploads/1/3/4/6/134698673/vajevupif_poxodo_volilewog.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/9AhdZCS/xidiwaxaruwitape.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/kexamoxusinixu/53082901044.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/57572003609.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/grade_2_science_worksheets_rocks.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/2069394466.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5428 bytes
SHA-256: 9cec6ce54172db61922d3db2e1e3a42045bf1ec588ff40117b3fd0ad8e4b3e92
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10700 bytes
SHA-256: 32cbb27833df62cb8ec411b98398c4edca3c458159465fc51c375bee95097b7f

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