Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f99a3833369b12…

MALICIOUS

PDF

77.8 KB Created: 2020-11-25 01:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 52dc8b3126dc6587e078241622b18cb0 SHA-1: 17dcacbe9b94f2422dfc1606e4e9d1870d4cf00e SHA-256: c2f99a3833369b12525a6fc33d8bd0ae0839ef5e9c3c88946fdff5ca734353e1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of the links points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/strik?utm_term=michael+row+the+boat+ashore+lyrics+meaning In PDF document text
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/cefded7e49a223.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdfIn PDF document text
    • https://logozirajukafod.weebly.com/uploads/1/3/4/8/134848231/detuj.pdfIn PDF document text
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/tosile.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/06b38d68-96ca-424e-a332-d487e15751de/mastery_charter_school_uniform_polic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e831146a-3718-4c68-b8b7-398f3c85eda2/la_lampara_maravillosa_valle_inclan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fe5ed8-37b9-4aab-ad60-2e96b7d20d68/bezigonujuvob.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/recyclerview_android_example_with_retrofit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe415b3-b9c5-4651-b822-a6996e53b576/example_of_personalized_pricing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c29f2a8-c83d-4a4d-8770-6b562da221bc/vumilenojokonomesure.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/mn_raffle_2020_how_to_play.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/unit_7_world_war_2_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/computer_network_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47415e16-c69e-4fe5-b02c-73c7944c708e/definicion_de_talento_humano_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e502d0-8bb7-4c00-9e9f-1a899fd8b804/97854746851.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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 5552 bytes
SHA-256: 4566a84fe5298d3b07f8972b7e20812883b13dc6365876b39d2ad90149aade35
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 10200 bytes
SHA-256: 7cf731f4ede3dc49974ee7736bc6e1d7b76e48c0f2cc21f1bafca39dc2c5eb33

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