Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4efdd03d234b70…

MALICIOUS

PDF

72.5 KB Created: 2021-06-12 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 028b5a89f71884694eb8c0941bb16a90 SHA-1: 7504ff8192db37845f198494306573566b339bf5 SHA-256: ce4efdd03d234b707321cd8a224113753c373c1c98fb078dce112f878f43a2e6
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/pbw?utm_term=9th+class+english+book+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5ff210d60b3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_601c8e0601ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fe621242c78b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc7752b3cd7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_6009edcb583ba.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/3716249.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/sokazuzaxaw.pdfIn PDF document text
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/eb626.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4491168/normal_60b000c712927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5ffacc01438bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_5fd385a5f38fb.pdfIn PDF document text
    • https://bafejavug.weebly.com/uploads/1/3/4/7/134737311/90c864d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fdd97576722f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff01eb93ca7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_6025ea59447de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_605931653bff3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4452381/normal_60b5b28b1739a.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/5fb75d88-ed3b-4000-8d79-6cdc1f5361d7/winalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de226996-904f-402e-8b2f-caf9a6af0cd2/how_to_prepare_hr_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cc1681-6f16-42a9-a5b0-4e1a297a3d57/rexobobafanopusezojukoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b97a62c-ab33-4844-be44-c99e6606d746/28840990642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6cb7035-8beb-442f-bc4c-dd95f4f05b59/71263694509.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5772 bytes
SHA-256: 7043a59f5ed5474df51f362ae6db34718921b5df7790941884dbd35840b52a13
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10696 bytes
SHA-256: 0cc0baa98c06f451eed7225c1415c052c362771b9781883711e7953a3dca4d94