Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd28ab6ae92280a…

MALICIOUS

PDF

68.2 KB Created: 2021-02-20 03:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e29ebcbee0d50e52f2f17575d0e31e26 SHA-1: 06fe6ab677059e18df999fbee10cef0473c517c5 SHA-256: 5fd28ab6ae92280a7e0a7edb73f5527fabf78dbd606685e5adf847aca53e8a49
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a common tactic for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

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://maypoin.ru/strik?utm_term=social+security+salary+cap+2020 PDF link annotation
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/9143f47a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc63cea265fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_601a011ed0f84.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/besobixus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fd8571656139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fe531b116086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417652/normal_5ff194b97ae3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_601c5ca4b8db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_60260e0b83d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_60143f934e993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_60264e15f3f64.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/xepululejiwof/batch_file_apk.pdfIn PDF document text
    • http://susebuxusebug.epizy.com/47742296310.pdfIn PDF document text
    • http://jajowisomipuw.epizy.com/lopiv.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_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 5404 bytes
SHA-256: c174efde3cdfef345f208014a6a3f1d7e3f4187211eef24aee524e359f32bdbe
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 10460 bytes
SHA-256: 4186733f9c45cb290615e1bb3c3bb7b8340b4eb994d84b9d62b43d908655d1a3

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