Malicious PDF — malware analysis report

Static analysis result for SHA-256 9047901f0b91b62b…

MALICIOUS

PDF

76.0 KB Created: 2020-11-13 00:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 09cffa86f6cbd87b24f654167b146639 SHA-1: 97841ec26c6ec20f7ff237f9411d68f0b8b47cde SHA-256: 9047901f0b91b62b67ff493b99dbc7f2fb069bb43c5c2d61edcb2db30550c53f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a LOLBin command-execution lure. 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafficel.ru/123?utm_term=dios+te+ama PDF link annotation
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/413600.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f9ae309b4af3.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/5598480.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/90e6d.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/tilakebokasuw.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/xezot-lasoxegemewe-nifeve.pdfIn PDF document text
    • https://uploads.striIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/msr_c600_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/curly_girl_method_handbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc6162a-4f81-4922-9a19-50f1bc032eec/zituzojipabifapo.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/sodowide.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/1992018570.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/26098889626.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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 4700 bytes
SHA-256: 2faad4bbbf6c3bded7fd636442996a1db6ae5b179877073741565f3407c2c89a
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10564 bytes
SHA-256: 50288490e1542ec1f092e3e048d867a3c37833788a09c0294a84cdc01cd5d799

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