Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f81e2268c7fc97a…

MALICIOUS

PDF

72.9 KB Created: 2021-02-20 12:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0a102fec3fc8e305694a228a8e5504de SHA-1: d6fffcc1fc1966c3f16cf16667bbee427d8c7813 SHA-256: 4f81e2268c7fc97a806fcefab712672554cf91498187757240d69817abfafa05
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The embedded URLs, such as 'https://seumenha.ru/wix?keyword=where+are+the+interior+plains+located+on+a+map', suggest a lure to external content. ClamAV detection and ML classification further support its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=where+are+the+interior+plains+located+on+a+map PDF link annotation
    • http://return-0.com/28824238378zkatb.pdfIn PDF document text
    • http://help-nanny.site/gogilageveveklyftm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5ffb2eccc3a40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5ff177f2b0b15.pdfIn PDF document text
    • https://rawewefugu.weebly.com/uploads/1/3/4/3/134394717/b5efb601592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5fde502156082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fdc3a8fd3f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_602e2b5f4b11a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5ff965c6a35da.pdfIn PDF document text
    • http://filemarker.store/95077662363a7n5e.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/38779292643u5tcp.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/1422507.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/MyijfLc/94183515397.pdfIn PDF document text
    • http://nickned.me/9045218425268bkk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 5324 bytes
SHA-256: aef77c31661a449b6116d6281cab354a4bb409134e6df941de07f40839efb92c
font_01_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10952 bytes
SHA-256: 6b894133eeb7cd787001b2e5e31415d1832cb08b54b73173433ec1a50a4f8162

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