Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f43ae8807599462…

MALICIOUS

PDF

89.8 KB Created: 2021-03-16 22:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9e8f931331dc877566cf496c78dfeefa SHA-1: df3b016dd2347e426d54651d881eff8127e89f6c SHA-256: 6f43ae8807599462460f5ec0e6df6808c753fe331a6218cd44e800d0024aae8a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and generated SEO-like URLs, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=secret+video+recorder+apkpure PDF link annotation
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/b65f40e24b5.pdfIn PDF document text
    • https://tenifapinam.weebly.com/uploads/1/3/4/7/134711228/24386.pdfIn PDF document text
    • http://visemomasa.66ghz.com/zefiraliraterunimo.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/8529750.pdfIn PDF document text
    • http://iblack.space/sutewawurizufarojejukikemjziw6.pdfIn PDF document text
    • http://seplafond.xyz/why_isnt_my_heater_turning_ondf7o6.pdfIn PDF document text
    • http://fuxofexafot.iblogger.org/fine_woodworking_magazine_archive_dvd.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/26906796324.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/5296474.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/1055304.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/b0a42a00-23f7-4f5c-a291-2d8440c4f8f2/a_dance_with_dragons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c050160-de41-4f79-8a21-ed85052c78e1/43256901600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4ec1fd-9c5f-466b-976a-2139fc84b0c3/safety_orientation_checklist_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75081e9-3be2-460b-beee-e86814b9fa4b/10989624331.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/vavaxadagujizevadam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07fe8d35-c3db-4a9e-9caa-1b393fc8a38e/pazapegoramalanazew.pdfIn PDF document text
    • http://nogomazarem.epizy.com/best_man_speech_example_template.pdfIn PDF document text
    • http://jasumubi.rf.gd/11710867401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad01de6-7559-4b42-8de7-a45264e6df13/glencoe_geometry_9-3_rotations_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aec6004-81b3-4df8-bb0c-6be4e35b9617/is_the_covid_app_safe.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_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 5084 bytes
SHA-256: eb91b1b68ed7b6e03ba56da7301cacc6a2bdd37f06a0923f4211296f228dc87c
font_01_sfnt_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 13440 bytes
SHA-256: fe4546abe8e13cacf1c18f701dabbcb0d5698e52881609ddd5f5776e4e269b7e

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