Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6395bd995db09b…

MALICIOUS

PDF

82.8 KB Created: 2021-05-20 05:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 25e77827cbf4a16d21abb787a43386e0 SHA-1: 115d87be9438f3fbb723556c842f8779779ed102 SHA-256: 6b6395bd995db09b855bb7fec5d881b51cc82f4f153b7ca3c58e7537b79981a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=what+are+the+responsibilities+of+a+crew+member+at+mcdonalds PDF link annotation
    • https://filalodov.weebly.com/uploads/1/3/4/6/134673241/8a69aeea01db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fd110eaeb3ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_6006dcd722406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_5fdfef5dce982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5ff4ca15b077a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_603b5f0b200d7.pdfIn PDF document text
    • https://xezuboziveza.weebly.com/uploads/1/3/1/6/131636845/zodesozoxafilal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_600de80b86fae.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/vabobatubefojizisago.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/lopasixiberat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_5fe9115eaf427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_6011daf0ce152.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/5750044.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/36978.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/80decc81ac2.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/985648.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/kemedonabepeleno.pdfIn PDF document text
    • https://dofebafedu.weebly.com/uploads/1/3/4/5/134588227/23206fd87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3ebaf1-6fa9-4eb4-9e32-cd7527039d94/zapibudatew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86122ff-9fe7-44e8-9225-78bd2b7543cb/tapapidapez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b5fe95-23c9-4868-abf5-d3cda7731957/lugevovesa.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_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 5640 bytes
SHA-256: 59516fdec456f52341118d50a5b1a774381743ce62ccc27674ea4905a031519c
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10668 bytes
SHA-256: 783e8a8ae4e1e9c6da5b3030282d8d007ec228cefbeda950ba7f263fa74e10b6

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