Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d50edf18ca77f6…

MALICIOUS

PDF

72.4 KB Created: 2021-03-16 13:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5bc79a58e987a4591e5ce8bcc6d121b SHA-1: b58b20fb6db11ad633d39fb02b791219fce8682e SHA-256: e9d50edf18ca77f65777596a529cab09eaee7b36176b602dc43a9333b6ddeec6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary external URL, https://zajinet.ru/award?keyword=counselling+skills+for+managers+kavita+singh+pdf, is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=counselling+skills+for+managers+kavita+singh+pdf PDF link annotation
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/9320825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_5fd73bb62bb82.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/1182708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_602c9f477b08c.pdfIn PDF document text
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/nubezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_604943607143f.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/98af36.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/getesev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_6042d541b8562.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/9471941c-bbea-4efb-ba8e-93eaafeeabf5/6709689504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d605dbe-9ffb-43d4-bdb9-40541bf193b9/kujokad.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_ef3b6565c514455284a7e46ae76d4691.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cff80c7-60c7-40ef-ad74-c570251cc9c1/55021911180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb94290-09b8-472c-aa66-b52bb852c35c/fx-115es_plus_scientific_notation.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_e7b2087ed72a45f2bc07ff3e7c85fd3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fe0649-33c1-4eab-8ce1-ed7535399b43/rabamerisojoponujirenoguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb56af46-64c0-49c4-90b8-9c3419d2c59f/58253801638.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_26a1ba7b7def4d4cbcca58f5c3787b61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kumasala/zodebalad.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/gapewewotivepeteped.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_1f136d831c76486da20162d9447fe78a.pdf?index=trueIn 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 5484 bytes
SHA-256: 21f2c66e80087673b7f14414a190ab04d824b2f662b0bf435d4c02ef43d4f4ac
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 10896 bytes
SHA-256: 435844b34574dabd1d74f369481439ef989c1b6f24fd59a6f864598713808139