Malicious PDF — malware analysis report

Static analysis result for SHA-256 8134bafed7b316e3…

MALICIOUS

PDF

70.5 KB Created: 2020-11-17 15:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 66680a79112aff72b8b76de4210a76d7 SHA-1: 9c2fea93d7082ca3d787155d7ffa4a742c0813b9 SHA-256: 8134bafed7b316e3c589227ae18861fe42aaa20161098e92048fa54cf88ea698
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=ira+rubel+develops+offset+printing PDF link annotation
    • https://mokogexikimowo.weebly.com/uploads/1/3/4/3/134321985/2549578.pdfIn PDF document text
    • https://falerelijiwega.weebly.com/uploads/1/3/4/6/134612416/valotumekevap_bujaxopas_tazukusikirim_lebukup.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/likenaxide.pdfIn PDF document text
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/xedakaj.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/9092188.pdfIn PDF document text
    • https://sinevojixataxer.weebly.com/uploads/1/3/4/1/134131740/5b5a56af7a44.pdfIn PDF document text
    • https://wotufoxak.weebly.com/uploads/1/3/4/3/134308946/xoraxopejix_nozelawusejasak_mixereduzojefos_tuseruw.pdfIn PDF document text
    • https://xolisibi.weebly.com/uploads/1/3/4/4/134462635/1d5dfe59a6eda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/titugome/kibedofonobetudubiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/dikew.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/28724376661.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/the_stanley_theater_pittsburgh_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/difomawavigipivebunibep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 5228 bytes
SHA-256: a39d44e3266d2305578b95aa863b9e652b8c9dea50074c76f6eace79bb8b14d1
font_01_sfnt_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 10336 bytes
SHA-256: c9cccdd399ae5a3cc052ee0e6171ddb738f83d268e6aa44f7ab08023017549ae
font_02_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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