Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4e69066aafe949…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 22:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e2aa1f9bc8aef84790e1e120347ac5a7 SHA-1: 99c21a1b003aecf3de5bbcde56d31468c88c7092 SHA-256: 9c4e69066aafe949636ac62543c58ff6a009d56c5f39c64ef9084cc1705cec3d
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, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=is+no2+covalent+or+ionic PDF link annotation
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/599625.pdfIn PDF document text
    • https://womepibenim.weebly.com/uploads/1/3/4/0/134040947/2603713.pdfIn PDF document text
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/ff6dbcdfe99f2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_602edebe8cec6.pdfIn PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/21b074f982d1e9.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/nirigojoxula-dediju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_60011eaf8b467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_6036e0181df91.pdfIn PDF document text
    • https://labimatejodo.weebly.com/uploads/1/3/2/3/132302966/30d5198e51bf69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_60262da2374c1.pdfIn PDF document text
    • https://vedagoxa.weebly.com/uploads/1/3/4/4/134498973/23b68c69187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144560289/97058872229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07f8374-51cd-45f2-9d5a-9f58fbb42e58/best_selenium_tutorial_on_udemy.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144878769/52765518021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3726660-3b4c-4ed5-a7c0-a082aa6e5ceb/19608601191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f01a48c-7ee8-49b7-b331-1e7c8bb1c749/77989326548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82741f26-c8b5-4c32-83d1-f0251d594b8a/how_to_get_the_sun_and_moon_starters_in_sword_and_shield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dee5c5-6c67-46a9-b987-c3cd8f65da17/amazon_dark_tower_tv_series_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd16424-fd13-4c70-bba5-4a4c26ae37fb/tefejugabewigunaneruno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267696c8-324a-45a9-870b-17fbf6555618/how_to_unjam_a_bostitch_electric_stapler.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144875610/goruri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2294a99b-6588-40d0-87f8-0b2d0e49f9b4/xofesarixiwanetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa143e6-985a-4ea1-b41e-5d4ed15fc119/irregular_verbs_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e1d1b2-979a-400b-a531-2514a96e8dbb/jobuxu.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 4920 bytes
SHA-256: c0a7cb405f16ea74a0883650d804d71c167788659646b020412ed5a223ebac50
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10552 bytes
SHA-256: 7890231c2533b2b90ca14500a2231e0e45419ab84f9da8189c756cfb61b28a8e

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