Malicious PDF — malware analysis report

Static analysis result for SHA-256 db93bafcb7b50fb7…

MALICIOUS

PDF

94.6 KB Created: 2021-03-27 22:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4ebd28167229776485edc809afff76a SHA-1: b406e56a70c54efb32ef32b4bb7a900e2c8fa40a SHA-256: db93bafcb7b50fb763ad7d64ceb334f44ab5af76ef2cda078548343c15b0ef53
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=safety+first+ear+thermometer+49659
    • http://repair-planshetov.ru/takumadolekela2h95a.pdf
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5ffbd231a6299.pdf
    • https://cdn-cms.f-static.net/uploads/4421462/normal_603cad8f0b221.pdf
    • https://cdn-cms.f-static.net/uploads/4453328/normal_604e70a477114.pdf
    • http://demask.fun/239381804072zkbi.pdf
    • http://uscreditmonitoring.info/71231052444az9mk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/03c45aed-8866-4be5-8289-f2b7a7eb51e4/83801040101.pdf
    • https://uploads.strikinglycdn.com/files/ed2ed706-5705-41f9-9000-4ead1de85938/8th_grade_us_history_textbook_florida.pdf
    • https://uploads.strikinglycdn.com/files/85f18d4b-211d-4bb4-8852-5701b2945d2a/pencil_sketch_drawing_step_by_step.pdf
    • https://s3.amazonaws.com/bidurudilidujug/lomizanebi.pdf
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_31ab532a8555473fb4ac6d01b20f05d8.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4588613eff0748d7908980ae7dd45571.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d2eaec4-79d1-4e2f-9024-17bf8170cfe6/is_a_2000_watt_generator_enough.pdf
    • https://uploads.strikinglycdn.com/files/8d481b98-e471-4a4a-9cdc-c8c510ef51af/literary_criticism_sample_essay.pdf
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_9e14f9ba5f954e6dbc795b15f10da702.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/92891124147.pdf
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_1484445d5737464cb57c140dea50784d.pdf?index=true
    • https://s3.amazonaws.com/dojivewobasuval/bach_cello_suite_1_guitar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b8f.bin
15cac5b7725a2d923a15ddfd984237acbc96d019341da5063ff37f22260cdad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 5700 bytes
font_01_sfnt_off00013eda.bin
b04bf087b4f742704c8bbedd54922112c595ced367c1cf50b5dfa851d00b06d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDA 14148 bytes

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