Malicious PDF — malware analysis report

Static analysis result for SHA-256 236a91d716cd5e79…

MALICIOUS

PDF

105.7 KB Created: 2021-02-27 13:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 03742583b7d9d73ceec6fd56566b4d6f SHA-1: dd9871de576e85825aa14dc5e23f8fe6241fbf2a SHA-256: 236a91d716cd5e79373f908c397801141e18c383e6ef1949cde1297ac66c9569
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=how+to+write+a+lab+write+up+for+chemistry PDF link annotation
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/1fbb4aaae64b.pdfIn PDF document text
    • http://7gusevshop.space/napidufowokejasua4znf.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/4135407.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/what_are_reactive_oxygen_species_ros_and_how_are_they_generated.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/6424038.pdfIn PDF document text
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/xabobikug.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/kudazakoxavu.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/tovurixaxutuxag_badeja_zamexizukagiba.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/a5906dc7239d24.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/tasufagijaremo/datasheet_file._com.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/empire_total_war_dutch_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/non_horizontal_merger_guidelines_european_commission.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/mapa_carreteras_de_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/grading_percentage_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 5552 bytes
SHA-256: a94ac0a14439be579a23a72209fbd18577c471c614a4fdfc70c83548cfd85bbe
font_01_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 12552 bytes
SHA-256: fafb9a31a56b6e8a93dbda37a08c7268b2bf981c514dfb305309beb1ff06d1e6
font_02_sfnt_off000184a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A6 16084 bytes
SHA-256: b778697e4b6ce0ccae7911b6423184e4633bd3eccf4460cac772c98ad637a855

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