Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1840c223e1bcf95…

MALICIOUS

PDF

66.4 KB Created: 2021-02-13 02:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fdb571bd96c8ece0463ef430508c737b SHA-1: 246340a1be12caa9afd14e30573167e105224863 SHA-256: f1840c223e1bcf9588e19efd1b5454ff812b2432d1ea0cf447b6cd094bcc9a15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=tkam+chapter+26-28+questions+and+answers PDF link annotation
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/fagojakexorele.pdfIn PDF document text
    • http://domexogod.22web.org/avira_free_antivirus_crack.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/39b39e5af0.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/kiremopabalen_tewetuzigo_buzuzom_xidewedewetume.pdfIn PDF document text
    • http://the-job.ru/52132155925flf7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumutopefar.rf.gd/avast_antivirus_for_windows_10_software.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/expanding_brain_meme_blank_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/bones_wheels_shape_guide.pdfIn PDF document text
    • http://lorazak.epizy.com/vajoxoluvesixa.pdfIn PDF document text
    • http://kafudunafow.epizy.com/autodesk_student_navisworks.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_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 6024 bytes
SHA-256: e9f049cb44cd140c90e0681821a65291d5eb472fe3a74b464b138695113c3c8d
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 9460 bytes
SHA-256: 7c488675e7019f0fab9bd664b30842464186c138421e26f65b6548f0cce57b17

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