Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f54ae3d218bfcaa…

MALICIOUS

PDF

75.3 KB Created: 2021-05-29 18:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7485efa8c80183b72061d85a769fa96c SHA-1: e69a40186429ba68147310c4e220f375a7d1b2f2 SHA-256: 7f54ae3d218bfcaab446331a1cfe76c958187094d27508dc6823a4450d7e264b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=alabama+crimson+tide+football+injury+report PDF link annotation
    • https://wesemijotabiwa.weebly.com/uploads/1/3/4/6/134622043/musiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60249126c0c67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_6028f4515e7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_606cfd25c2700.pdfIn PDF document text
    • https://sagekafota.weebly.com/uploads/1/3/4/3/134351395/e61aff91a20fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_60063a658a03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_600f75e197f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_604e74a7a5105.pdfIn PDF document text
    • https://lugapageragije.weebly.com/uploads/1/3/4/6/134617753/ledekose-moleputar.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/92f69b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_601511e220e31.pdfIn PDF document text
    • https://setuzenizenu.weebly.com/uploads/1/3/5/9/135973655/dafemexirox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_600911bea7787.pdfIn PDF document text
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/3913234.pdfIn PDF document text
    • https://godebisexizo.weebly.com/uploads/1/3/0/7/130775633/3341322.pdfIn PDF document text
    • https://widutelakil.weebly.com/uploads/1/3/4/3/134378670/d1d001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc7d57034cd3.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/e53ca69f-cca9-4ff3-b2cc-4c4a41425b37/47903766408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe5b7d4-7aa7-470d-b031-5136bbd48524/wimapugesat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6143032-3a54-4a76-b73f-16f2ac042e27/schwinn_boundary_mountain_bike_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654cdc7e-9fd6-4181-98ef-7d3a4d91cffe/papojozazun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436647d2-42e5-422f-8360-bc738d2604de/setagojinifonovezo.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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 5608 bytes
SHA-256: f45a577977261f5daa82db3a5fb2cfd103ce19a0580aeb4e2b4b36666f4abbdf
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 11040 bytes
SHA-256: cee39b26756e6a3cd4227da2e8a9a580ec239b30805d2496544622eae13614e1