Malicious PDF — malware analysis report

Static analysis result for SHA-256 928e845adbe54047…

MALICIOUS

PDF

80.4 KB Created: 2021-05-22 22:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a045da167cd4b8a4225f079cba917482 SHA-1: 1719e1c2349b209f33e7f5dd00b85baff0311c21 SHA-256: 928e845adbe54047672b0e0402e6e243918e385539c0834b336559f3915ba284
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external links, https://ponafet.ru/strik, is flagged as suspicious and likely leads to a phishing or malicious site. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=did+patchy+the+pirate+died PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404310/normal_605889fa76b40.pdfIn PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/nedixumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_600f10d390e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_602898148e173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_600549eba7a0e.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/mugokawibuveku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fee373b89cbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fde69456c9dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_605b0e3e0d4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_601a466d84f3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5ff5683ba6061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_605911946fb1b.pdfIn PDF document text
    • https://lodetisider.weebly.com/uploads/1/3/4/7/134732723/beb239815f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5a9d292c-dae2-4c9b-9386-a52d4a332a5d/john_deere_214_tiller_belt_routing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ed1bc9-84b7-4af9-9e26-6a4e21871727/discipline_equals_freedom_book_depository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d38a87-db1e-4b7b-b2bc-3f3ac3a56eb8/77663553908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338be12f-fcd3-4686-ab7a-b51ccd0bf438/vivopezonabepil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10043a7-9913-430b-bf17-f495a523cc3b/how_long_to_learn_theory_driving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec140582-af27-481a-84e4-173b2798f729/27185259500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f9558f-5f7c-4364-b2a0-d865f2ed78ac/velocidade_da_luz_quilmetros_por_hora_km_h.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2140a9-39de-4ad3-8688-846065cd2d97/manhattan_gmat_prep_materials.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 4624 bytes
SHA-256: 645089ef8c83ac3b99f000ba034f183e5b483882809f3824af9e2339fa4d584f
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 10948 bytes
SHA-256: 1eb18920707e63401248d57c7b604320c52389929aaab7be36ea22b2199cd378
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3