Malicious PDF — malware analysis report

Static analysis result for SHA-256 adca3d9ffd4ad080…

MALICIOUS

PDF

76.9 KB Created: 2021-06-06 04:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 852e057f5abe0fe3c60674ee696c1544 SHA-1: 1679ead81a301f2fa47f2b61dedeff0c28148625 SHA-256: adca3d9ffd4ad08005a6b6ac46e3010151d953251af215ce25ed2ae2836a5d36
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=english+grammar+revision+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ffe53f574661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_603af7518b916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fca6ec734167.pdfIn PDF document text
    • https://jilolepileg.weebly.com/uploads/1/3/1/4/131453494/3285151.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/201f734ba.pdfIn PDF document text
    • https://pusoguxararafog.weebly.com/uploads/1/3/4/5/134593470/tigetupugob-lutowafefolepev-lerafa.pdfIn PDF document text
    • https://zitokafinug.weebly.com/uploads/1/3/4/7/134738680/1575713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_603cc12f4160d.pdfIn PDF document text
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/9481790.pdfIn PDF document text
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/0df4f2470d00.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/81df4a1cd395d.pdfIn PDF document text
    • https://kisobodowawon.weebly.com/uploads/1/3/1/3/131384145/1533819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_60189f67e929d.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/ff9c730f-2b7d-4639-90ce-4f66d18591ca/ponifonis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8111373b-5894-4292-b736-7354d76fb8dd/fiporijememuwirezamak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df1a451-ac24-4980-a1e4-f130cfa5e547/20239843400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe1544a-a3ee-43e3-9af2-536939433d73/9899259374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399e864a-5069-41f1-9052-c478e2cecd0f/atwood_2334_furnace_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7112d6-40fc-4f30-921f-536f5207bb76/gizugonitan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53ec1cd-203f-43bc-ae90-ce74b4afb58a/johari_window_questionnaire.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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5628 bytes
SHA-256: c6952a7a9b3e4ad4430e76400bc8bc52aa481bb0d6e3ddb50af4e4645ef52524
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11072 bytes
SHA-256: 553b2c318739e1f09e119cc3514fc2824eb1d9a5863c629a765190f3181cc75a