Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9934abc7acc3d4…

MALICIOUS

PDF

78.0 KB Created: 2021-06-11 14:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5906a39eda4cf10a257b239e06c14221 SHA-1: ef71f9d70e8cffa9ef8817d3d4509b195dd29e80 SHA-256: 5d9934abc7acc3d48abd2e4dd9b1d8089ec771850a30bf938a7f0e92ebdeca0e
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=123+la+movies PDF link annotation
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/301b5ac.pdfIn PDF document text
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/woberixumefogurenefi.pdfIn PDF document text
    • https://ribarifi.weebly.com/uploads/1/3/4/2/134266405/pasedusotile.pdfIn PDF document text
    • https://wajevubal.weebly.com/uploads/1/3/4/6/134687537/b83c4.pdfIn PDF document text
    • https://bosevexoliwi.weebly.com/uploads/1/3/4/5/134585498/ebb393a07a46cb.pdfIn PDF document text
    • https://pisubudanumiz.weebly.com/uploads/1/3/0/8/130874058/b6942097d2.pdfIn PDF document text
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/wewumitijazi-perik-zamatake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_5fe49ccd46510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506131/normal_5fe27891868ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_6030142f8eab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_601b81f62adc0.pdfIn PDF document text
    • https://miwugurelogubu.weebly.com/uploads/1/3/4/0/134000151/safag_wuvik_zubepogorigut_xezigat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fe8d887d3661.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/8b1dca491.pdfIn PDF document text
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/d124a.pdfIn PDF document text
    • https://siximegam.weebly.com/uploads/1/3/1/4/131453251/mojowawara.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/744596d5-288e-48fe-94e4-d69fefc822b7/fixed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ed5938-06c4-4bc1-8060-74e5764af989/fokaxolomiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0751fe-3ffc-4070-a98a-ff687239c45a/xopoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4aafff-68f6-4623-ab0d-7d1ef9da4e60/what_does_app_mean_on_your_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a94f7e-0867-4c29-b35a-996107993ec6/anatomy_of_exercise_pat_manocchia_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecde2b3-752c-459e-af6d-28822b4ab474/wibudefatipupuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c35b9d-a4b4-4de0-9001-fc4ddc85cae7/mubejurebawofobezafarew.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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 5048 bytes
SHA-256: a65b015c5ab777311b5febf56042fc6fb7f0b427a07b43d7fb3f681537722d4b
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 11236 bytes
SHA-256: eede552cabcac93b9287f0fb9882d40b1fb6f825b6ccc2315d089eb402b6e113