Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aae38791cff8b9…

MALICIOUS

PDF

69.9 KB Created: 2021-06-11 10:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e2cbc74f625d38c5aeedab189713853d SHA-1: 33d2ab9f4dccecb04a5c0086179ce065eca5a450 SHA-256: 99aae38791cff8b9af5fcc80bba731e2011c55ef2e42522ebd7865304b467b56
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or redirect to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure for a free PDF download, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=mapa+carreteras+portugal+pdf+gratis In PDF document text
    • https://lulogozikojag.weebly.com/uploads/1/3/1/8/131858975/1369022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_6009b3f8c0ca9.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/rovimowar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5ffa2812440bd.pdfIn PDF document text
    • https://tofitumo.weebly.com/uploads/1/3/4/7/134767961/cd7b7eb63e9476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_6019dc31352c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_5fe751dc62ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_603e35053620e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_60283d81ce13e.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/xopado-lijisejovizime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_60b8e380d9ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_60ba24a3c54e3.pdfIn PDF document text
    • https://sorolaxubamabu.weebly.com/uploads/1/3/0/7/130739744/2643356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ff288fb3f775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/145104966/biodata_blank_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62b5805-d97c-410a-b551-1ee02bb2d65b/ethernet_cable_jacket_color_standards.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/w/file/fetch/144903741/98870671002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70726c0e-0877-4d11-856f-b68c01d772ee/front_page_africa_news_liberia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c21ef6-82b8-464f-99d2-f29a4ea44f8e/72767552855.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/essentials_of_supply_chain_management_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a397bf67-d316-44eb-8627-946f4d0d88b8/can_i_access_wd_my_cloud_remotely.pdfIn PDF document text
    • http://nipekari.pbworks.com/f/pijasigulil.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144648768/biostar_g41d3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29175fe8-c99a-4d96-b525-a1e70bcd3548/the_new_you_and_the_holy_spirit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c490515-2ba0-4913-a901-553ea1126be5/67450243189.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_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 5328 bytes
SHA-256: 23f7d40540b6cca0281c013f7f4e4e46ea2fe753a8f9a11df21c4ac4ad33c83c
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 11936 bytes
SHA-256: 3941438c30357ddda03da08ef147911d019443b224bc6d4063143d87dc6b0ea1

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