Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc6edecdd5018ae…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 04:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: af54d712fcd356232dc6da51f9f6b112 SHA-1: ef309946194ab5f07a8283d5f473214e15a2d0f8 SHA-256: ffc6edecdd5018ae901e9ca3934aa40171f84784b54adff192b36982a3c5c52d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of multiple domains and link structures common in SEO poisoning and phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=bsc+it+syllabus+mumbai+university+2020+18+pdf PDF link annotation
    • https://rulafowobunafo.weebly.com/uploads/1/3/5/3/135391395/fudupop_vagaf_banukebajajovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5fd8481aa7e8c.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/32470506518.pdfIn PDF document text
    • https://webenimuto.weebly.com/uploads/1/3/4/8/134846763/3726244.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/zajezoriwawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_6016e76baed94.pdfIn PDF document text
    • https://tixuguzuw.weebly.com/uploads/1/3/4/0/134096155/9498413.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/3346787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_602898d8d63cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedizilunok.myartsonline.com/37774795824.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/changer_sac_aspirateur_electrolux_silent_performer.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/biogas_project_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3aefa6-0431-4d8f-a940-970a9e512585/lg_air_conditioner_error_code_ch_36.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/relating_addition_and_subtraction_1st_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457ba9a3-468d-44cf-a83d-9aa6a3716ac5/24421021864.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/hypixel_skyblock_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b16aeed-7f05-4db0-a47c-cf0dd13b8de6/29922310727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9df138b-372d-43c3-8a6a-77cc938f63e1/nujomene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3fd0dde-55ac-4f36-944c-76ae4b728367/what_is_the_main_difference_between_viruses_and_bacteria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb8569c-6445-4852-96a6-29fa2c9137f3/where_does_the_us_get_its_steel.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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 6172 bytes
SHA-256: 14d1e41bfd9446953940a08e4802ae4d961517d2c30cd698abf0132ddeeb1462
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 10840 bytes
SHA-256: 1fa1280edd4d96c8d7c9dd34417ab4c97cc9a75a5920804657575245376fea2a