Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8a058471522272…

MALICIOUS

PDF

82.7 KB Created: 2021-06-03 07:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fa78f388f1fa663e3a18d2ec89588871 SHA-1: 87ae636ab2665e55ccb55cfebe53537a87ec0374 SHA-256: 4a8a058471522272ea9943d1d797c126ab771f10622cd5832ef3a66986a934b3
156 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 0.9990

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://drafthe.ru/pbw?utm_term=livro+minuto+com+deus+pdf+gr%25C3%25A1tis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445750/normal_5fe27ae70be8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5ffe492c1f42d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_6000e8a9a282d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459341/normal_5fc86aa3dca6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5ff52d855c604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5ffbc48103fcd.pdfIn PDF document text
    • https://dududizenipurij.weebly.com/uploads/1/3/4/6/134651263/joginufegivan-basakobovole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_60601fecca059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_604e5c52d44a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_60537bc3a5537.pdfIn PDF document text
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/pavopel-lozusifiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_602ff209da70a.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
    • http://kimotamiju.pbworks.com/f/telirujusod.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/letova.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/9921815617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9411ea3e-4468-4388-8b8f-ad6cd0f41fab/tujataxapadekafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516e59fd-273d-4563-b9cf-15b2ddfc57e4/will_any_spark_plug_work_in_a_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7a3432-c5c7-49b4-b422-0450ab5cd7c7/79143902495.pdfIn PDF document text
    • http://lexibitite.pbworks.com/w/file/fetch/144537354/chew_wga_v0_9_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36828d4a-d78d-49fc-98d5-7698fabc317a/oster_kitchen_center_repair_manual.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/how_to_write_a_letter_of_request_for_internship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436825a6-fb36-4c23-aa38-7e78c4c7513b/96423564264.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/30361714183.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/cuento_tengo_un_monstruo_en_el_bolsillo.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 5348 bytes
SHA-256: 16bdd7dad4f5cac2bfcbe9bfe5a84d37ce3123aa3fb77ef0263f6d5e45949284
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 12884 bytes
SHA-256: d3817f08349f173b1826da92bfe440ede9c98e2965d19b569567eb0c826939be
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c