Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f775c4bf94437b…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 17:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6c1ba3cf869cf3c63d7b749f39e6da6b SHA-1: 730a619360b58e15dd80c07137f5c72454d6e740 SHA-256: a1f775c4bf94437bd697dad02994756a938a25a59180b7cba853f9ee7437d073
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=business+card+template+pdf+free+download PDF link annotation
    • https://lijujizakivim.weebly.com/uploads/1/3/4/6/134634855/5c47b015ff8493.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/579fbc09a8149.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/mapa_metro_buenos_aires_2020.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/calendario_ottobre_2020.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://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_aa875eec731a4f82945b05a6c075236a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/756baed5-50df-4702-b258-c3ddbb8010d8/307779541.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_afd542468fc24a939e7ae6c74fdf2eac.pdf?index=trueIn PDF document text
    • https://1b6a1bbc-c127-422b-858f-c975555fd18f.filesusr.com/ugd/31f47c_58c70c41ecdc44b98f8f2ee1d08a61ef.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_6c304b395f2445ff8977b36eaa5b0407.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e156aaca-4c15-488d-9409-516aabf460aa/daramuzulafatojisebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2efaffc-2b70-4647-99e5-27255cf55e9e/visokurum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3669319f-a55a-4c99-a35a-e0bcfd8cf97d/45339902709.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_e80560045a184171be3e0730672d7933.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/meters_to_feet_chart.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_ac313e59a7b44e0bb7676369ba706647.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_45f0fb89e0594031b6ab25b4452f7cc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67131b7c-9fd7-4411-81da-d550491f528f/87681920057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb6bd9d-9b76-4a17-bb2e-97b62f5d4ae9/how_to_connect_the_canon_mg3620_to_wifi.pdfIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/dijipexoralixixerob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca59667-41c7-44d6-bf1e-ecec67cd068f/61616085685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f362342e-f255-4ff6-aa3d-6b43fa373ffc/basudit.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5324 bytes
SHA-256: 032802d0b67ef768adadd2f982a14e33c48a31253c31b5be2a8e7a788811c999
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10544 bytes
SHA-256: 300eb19f7d61d2a070f989e26f3cc8440942f8a3d8b2f128a18f65b1539e3897
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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