Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e358259613ff0d…

MALICIOUS

PDF

93.6 KB Created: 2021-03-31 12:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1c44096a389c7773518eb843d5d6356d SHA-1: 6ca456bcc6b904cf0f9388c387dae428df58cd80 SHA-256: b6e358259613ff0de04e15059f4e471b3fb478dffa8ce8a23d8dd416aa760a8f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm hosted on disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no explicit scripts were extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/123?utm_term=plant+pigments+and+photosynthesis+lab+answer+key PDF link annotation
    • http://blacklaser.ru/sugolofiluvumiwerisidajill9brd.pdfIn PDF document text
    • http://idealica-italiaoficial.site/jufawetanugiv2k2j0.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/ff8b20cd78a.pdfIn PDF document text
    • http://bachanalytics.com/74732837285qqeo5.pdfIn PDF document text
    • http://podcard2020.site/platform_film_hd_mein_videoiv2zz.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/limorot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_714f915c11f14afb98ded6b38ade527e.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_0a334d8e04ae4ff6a596d454b1ded7ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e26018-d038-4639-8600-c17c40881ca4/ccss_6th_grade_math_review_answer_key.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_e126146f55c04f75a14b9787f40d020a.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_e623b740b6e442c8877ab7a1c740afba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4009770-ded6-41a9-be04-272a7b67158f/76219037518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a76e9ca-6fef-4ee6-a7b1-10b4ab878ec6/wizusuritimakukodepoxeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd81b857-4221-4cd7-9664-724591169c93/luvolavina.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_0acdb0473347489695b01c9913873e53.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_886df6f779ef40549beabd58f84a911e.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_70d5523cfcfc47da80caa3da507b8859.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_42f9fb7689354066a84fa4587f4e7ad8.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_3273919b3b2640a69367784b1294da2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9411d81-23fe-4090-a7ae-416a0ccceb14/is_the_smithsonian_open_on_thanksgiving.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_05160490512d4762866d17c0793ad490.pdf?index=trueIn 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_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 5772 bytes
SHA-256: 4ba233ab6320f8d546f3d22a230ade5d272ecae96d69c8d95e03f3157be57f8d
font_01_sfnt_off0001400c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 11932 bytes
SHA-256: 40d510f15101e4e3c2f8accc0fb40ad3e4438489fd73b2c799e864a34097ea76