Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae139a1f4eed12ce…

MALICIOUS

PDF

74.8 KB Created: 2021-05-24 16:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 030dee515b14e7086189c1e6ef942616 SHA-1: 25fa06f210f2cc029ac595172f540544960ff5f2 SHA-256: ae139a1f4eed12ce5c29975b14268a8a5c75a0ae577e286ebbe0d5e224a4f499
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious sites, such as the primary IOC: https://mezovuduw.ru/strik. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is used for phishing or distributing further malware. No scripts were extracted from this sample.

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://mezovuduw.ru/strik?utm_term=how+do+you+use+a+wahl+eyebrow+trimmer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405197/normal_605cd3f31c959.pdfIn PDF document text
    • https://rugakimi.weebly.com/uploads/1/3/5/3/135323030/9581956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_602e996dbf388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_606611eb180a2.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/ledalejud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fcd6f5217c93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5fee4d93f23b0.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://s3.amazonaws.com/rozebofukixus/86399951882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712e31ec-d806-4280-abc4-0de8ef2bfbcf/what_are_the_11_nicomachean_ethics.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/bufisabatuperisasiposudak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d598a2f9-2089-4de9-870f-ddd8bd136a9b/14473518460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f3d125-cb8f-49bd-a590-784b9b868ec6/96501726513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1a684c-5cdf-4e47-b480-e8ea14f2e2b8/91532142920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2408a7-c894-4858-bf9a-54da0762f4b2/how_many_carbs_in_arbys_potato_cakes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3d1f50-581f-44fc-b4d7-9a90d9486cbd/tipos_de_plan_de_negocios_segn_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f59310d-edd6-4603-8276-85b2a3e3dcdb/bidip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ed0ca3-9571-4dbe-985a-2f2fa366258c/topibuvekixepoxelas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7add88b-7c3b-4fad-89b1-929aca196f83/what_is_long_covid_nhs_scotland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c0fffb-ab9b-4ff3-a1f1-2d6f1c5ff3b1/armitron_watch_wr330_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f319ec-22bd-4d1b-a037-e6d0571f0f4a/68471496004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b5706e-d7a9-4c4a-8a26-e8e8e9792dfb/61552335417.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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 5136 bytes
SHA-256: 8ef05e94c9489e10e571d3360f2b4b39f727c5e56c88df2aa5ffba8397728c38
font_01_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 11052 bytes
SHA-256: cce2db119f59e3725d4570d00d837a62a956220eb86913d9865507e41c91798f
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2