Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f68968e8e1a5312…

MALICIOUS

PDF

108.0 KB Created: 2021-03-22 09:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a9cccea34b3ce778897e172257e9db3 SHA-1: 4cda9b7d5b9aa26e305b22dc0918b923ca2831a7 SHA-256: 6f68968e8e1a5312b43f4b947bcf3fcbc68dfe38de3c5da468bd7a561d0ff35d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms used for malicious purposes. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jacksth.ru/wix?keyword=dsn+2020+rankings PDF link annotation
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/malezabit.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/witafiw_pokem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6017d73bf3c8d.pdfIn PDF document text
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/9586025.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/mibedudik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_602e556b4792e.pdfIn PDF document text
    • https://sogakuguw.weebly.com/uploads/1/3/1/4/131453515/5a02c93d3.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/wufufufem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_603760fb42eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_601e91f070fba.pdfIn PDF document text
    • https://tovegema.weebly.com/uploads/1/3/4/5/134505564/ec52830.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/8b12431a-356d-4f77-a2c1-8e0fe048ecd6/96045521436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4047946d-6225-434e-befc-6b310f814d06/niniduwibima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1053c162-02e2-40c5-a287-35d9bac44f7b/yamaha_djx_iib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dda0674-74f4-42dc-b9d4-b2d5fcc91537/kuxakakuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c95b8bf-3358-4981-a2c7-63eb49408c98/79273824070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d59bc1b-8a1e-4a64-9204-d9b46475aae7/89928743322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0635535c-909e-47bc-aac1-fee5d3bb88c7/editable_savable_dnd_next_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca39a6aa-2aea-4389-844a-5ab2da663a1a/why_was_divergent_banned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87abc46d-4721-455e-ad8e-b13af6ae52ed/how_to_size_a_room_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab05bdfa-44b8-4070-90b0-816dcfa31c53/tijabenawavotilov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39da193a-ca9f-49ff-b8b5-38d93511efd9/cuntas_veces_es_normal_orinar_en_el_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1e1d9c-0f56-42cc-ba2e-a81d9de64a21/sarutu.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_off00016b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B03 5156 bytes
SHA-256: 84517dd335df6bd21249862bdf3f740e6c2955f8bea25ed5ed0b0c5042130bad
font_01_sfnt_off00017caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAA 11144 bytes
SHA-256: c6243fed34bf1d337954f660b64dd8ad4e134fdd369acf75c9c8bab4e7b315db