Malicious PDF — malware analysis report

Static analysis result for SHA-256 e628c421035e364f…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 15:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8900b54f36422aa2bcd13c2ae05a6e99 SHA-1: 165a53d579cdb04a6f847b75a42bf0929803ff20 SHA-256: e628c421035e364f6fc7861cd0cfb1d07f101de4a87bea46f37cdabf9f792d7d
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 0.9997

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://bologen.ru/123?utm_term=how+to+open+my+sentry+safe+with+a+key PDF link annotation
    • http://wigutanibip.iblogger.org/93235491611.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/11b4fc07f1.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/9051004.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/guLnblV/lock_screen_password_remove.pdfIn PDF document text
    • https://nagiwavimev.weebly.com/uploads/1/3/4/6/134612684/af3a9a1.pdfIn PDF document text
    • http://bugesawuterodam.iblogger.org/tipokotubawumewewakukotir.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/c1c09e129.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/metubevozisul/41671497319.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/apple_airplay_to_android_box.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/merriam_webster_premium_apk_revdl.pdfIn PDF document text
    • http://nenujogi.rf.gd/958608561.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/nibimir.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/dozuzuvuz.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/1282452759.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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 5328 bytes
SHA-256: 01506b5ee5116d527c968d2dbc8f51b281a79036905557845d552f3e90c814b4
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10704 bytes
SHA-256: 848b6452e67a5e48e2e4b2ba4fedafa49f9698a9f575fc99e9a0cb4bc7dcfa49