Malicious PDF — malware analysis report

Static analysis result for SHA-256 631c79e07b59d5c9…

MALICIOUS

PDF

83.4 KB Created: 2021-02-12 00:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cea92465d79fb50ff2f6512ba2ac84b SHA-1: b1413dd2dbe734b4a2c223d738a209efd19097cd SHA-256: 631c79e07b59d5c99fca80c6866c35d47295a39eb95b89358ce790821d8cd8ca
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/wix?keyword=d-day+reading+worksheet PDF link annotation
    • http://cmb-societe.com/fimelanotaponanapabevitgf5ln.pdfIn PDF document text
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/fipekexopavubarorafu.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/nanofepanixovutopi.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/1709885.pdfIn PDF document text
    • http://alkim.xyz/yearly_planner_template_excelh0asm.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/simivosusu.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/xoboxofikafizafnfn8u.pdfIn PDF document text
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/rofofaz-jetekumudewunap.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/wixanarer/tuvejika.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/social_entrepreneurship.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/horizonte_perdido_1973.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/jakogiwizagok.pdfIn PDF document text
    • http://rumavajusugeg.rf.gd/91112562682.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/godesezivasepofolovitugo.pdfIn PDF document text
    • http://miwofalixi.rf.gd/nelezakeboziwa.pdfIn PDF document text
    • http://ludujefu.epizy.com/zimbabwe_auditor_general_report_2018.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_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 5132 bytes
SHA-256: 86114ebee311b4680fba66d15fd2b0840ffca9ba461059e49836af1f43f187a6
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10996 bytes
SHA-256: 551111f9de27914f9640fb96677e85efbe215aa8ece84cd64605de7284e2402c
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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