Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7f679683ea5e34…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 18:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e7f9c81c246b4fc7919f1f9f8cae90 SHA-1: 76baac65e48b18dea07d6b83533acf6fb6b37438 SHA-256: 3d7f679683ea5e340c1f12bb0e67595525b6b17e326269df167deff3f5cfe3ed
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of embedded external links, with the primary URL being https://seumenha.ru/wix?keyword=b%25E1%25BA%25A3n+%25C4%2591%25E1%25BB%2593+vi%25E1%25BB%2587t+nam+qua+v%25E1%25BB%2587+tinh. The presence of a "PDF_SEO_LINK_FARM" heuristic indicates a likely attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=b%25E1%25BA%25A3n+%25C4%2591%25E1%25BB%2593+vi%25E1%25BB%2587t+nam+qua+v%25E1%25BB%2587+tinh
    • https://jowozulabu.weebly.com/uploads/1/3/4/0/134013075/fizixikexezixu.pdf
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/temexijun_faxowozez_fudifox_gowefo.pdf
    • http://repaircreditscore.info/pifitudizugupovepen0p1l6.pdf
    • https://cdn.sqhk.co/vofonowul/jIgiaOq/99407205948.pdf
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/jolagonomolisag_rotodimozaz_kivudaba_vuzovoxu.pdf
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/xisigufexexedomuk.pdf
    • https://cdn.sqhk.co/nadetajagupe/gcgh5ja/kedup.pdf
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/lofutexoruxipudaved.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/girilifawuxi/aranmula_vanchipattu.pdf
    • https://s3.amazonaws.com/juzinaramip/42523820457.pdf
    • https://s3.amazonaws.com/buganabowumujef/80566549535.pdf
    • https://s3.amazonaws.com/vuzufexarevima/dolapebi.pdf
    • https://s3.amazonaws.com/divikufifir/working_capital_analysis_project_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b5.bin
69c01095b03ca97bff0d866bad6d64f116b3ea16b06941a8c41583ebc7b23304
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 5608 bytes
font_01_sfnt_off0000e7a4.bin
0c0f81fbad9d9d7c0c00ca96289820b3c6e8db2975fbbbc259460f2f63f1badb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 22660 bytes