Malicious PDF — malware analysis report

Static analysis result for SHA-256 839701a334f1d068…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 17:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed20618fdcddc0bf4d9576bbdff3dad9 SHA-1: c652ebe0e3971142a75660b6eb65789fbc4e50f6 SHA-256: 839701a334f1d06863901ab8f834a1324506063f6f3d29ff7376ef9b009a15c0
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 0.9998

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://zajinet.ru/123?utm_term=alkaline+food+chart+pdf PDF link annotation
    • https://vilewojux.weebly.com/uploads/1/3/0/8/130874250/6048e4d.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/0c3d249a7540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fd1c061539db.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/A9jizgd/sirolimus_vs_tacrolimus_liver_transplant.pdfIn PDF document text
    • https://sujarazigis.weebly.com/uploads/1/3/0/8/130813042/poxutiz_gebel_xojuzapan_wanolo.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/eidK9Xr/64631190710.pdfIn PDF document text
    • https://kotazuzufanimik.weebly.com/uploads/1/3/1/4/131438495/3360784.pdfIn PDF document text
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/8b63144b5.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/kotodur/48768143566.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/jinepigosad.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/14315583837.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/duvudapu.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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 5116 bytes
SHA-256: d5577c53b74fdde3422cc51f2390329bb98b8cab078c8253cb35f331d6cb5724
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 10652 bytes
SHA-256: cdc2b6ea8f6379916662d03cf31c71e57f15f4af5a602556ad96fd7f09ed8f32