Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c2e10ab803907a…

MALICIOUS

PDF

87.6 KB Created: 2021-02-23 02:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5821db8e037d8c54cc179efbf4fbefa2 SHA-1: 59001876e431f7851685380d211f043dc744995a SHA-256: 56c2e10ab803907ac38c829eec5f1ba10d2519bb12da66aceee8ffb00c0ba847
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one pointing to a suspicious domain (jacksth.ru) that is likely used for phishing or malware distribution. The presence of PDF_SEO_LINK_FARM suggests an attempt to create a link farm, potentially for SEO manipulation or to host malicious content. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=how+to+use+dish+network+hopper PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/0L0dwgi/dokadoxofiganegadomo.pdfIn PDF document text
    • http://opticsystem.website/xafotixalewiwatb1yy8.pdfIn PDF document text
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/6919808.pdfIn PDF document text
    • http://dkshlyap.ru/kenifb3non.pdfIn PDF document text
    • http://toppiksnack.xyz/826824188862vk2e.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/67520b043cd9a9.pdfIn PDF document text
    • https://dakesobefugem.weebly.com/uploads/1/3/6/0/136056620/15f964577.pdfIn PDF document text
    • http://graatorama.space/shawlands_primary_school_inspection_reportt45wa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gogunabones/kumaun_university_admission_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/story_of_seasons_guide_fogu.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/32112235958.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/63955792649.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/main_akela_jee_raha_hoon_song.pdfIn PDF document text
    • http://degedudu.rf.gd/godex_barcode_printer_driver_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/used_to_would_past_simple_worksheet.pdfIn PDF document text
    • http://bewaxupu.rf.gd/loporotifa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 4804 bytes
SHA-256: 92cc5e6e363dad585e3047be0d490180b64f3f3fcc1d8f59ce3b6709a24cc075
font_01_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10164 bytes
SHA-256: 5bb9cca51eddf0827a39bb478ef55ad721e8c8737804c1f74f406df0dccc7fde
font_02_sfnt_off000142e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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