Malicious PDF — malware analysis report

Static analysis result for SHA-256 37886d837fe09d9a…

MALICIOUS

PDF

87.9 KB Created: 2021-02-23 15:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5cbeb627928d4b7db07fa511a04a06d6 SHA-1: 26ef1f2daeb2f2eae6ef1655037be4716677617c SHA-256: 37886d837fe09d9afae78389f7d3e4b3490b973de8307b1fcce40524454475cb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to phishing sites or malware. The embedded URL 'https://maypoin.ru/strik?utm_term=excel+vba+dynamic+array+as+parameter' further supports the phishing or malware distribution vector. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

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=excel+vba+dynamic+array+as+parameter PDF link annotation
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/dapedos.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/jhihBha/13348379172.pdfIn PDF document text
    • https://wilalupesakugos.weebly.com/uploads/1/3/4/2/134235894/zexokobavizosiki.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/eja9jeK/jifiwapabinedifejaderu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_6003f95293de8.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/h7MZ0je/kerusojom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_600d7c0782d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fdda3f26b2c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fc6a3c7f0230.pdfIn PDF document text
    • https://nefadojajekewa.weebly.com/uploads/1/3/0/8/130874163/5427335.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/ChegdWF/katenufisedo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5ffcc00637919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5fcd02ef6c07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6030539dd068d.pdfIn PDF document text
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/gidolowuwuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tituroxir.rf.gd/58163944719.pdfIn PDF document text
    • http://vubedarav.epizy.com/lujuxen.pdfIn PDF document text
    • http://suvoxezol.rf.gd/13961132903.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_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 5548 bytes
SHA-256: fc031e5cfe672e05742b86c25b55fe4b23bc87db907b50e5f65da05ca9f610f0
font_01_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 10812 bytes
SHA-256: c4128d1263278d8955d0b72f65317b18ea7a22b5b391082ddcbd9a47ef5ca8bd

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