Malicious PDF — malware analysis report

Static analysis result for SHA-256 67232e0958e2bd47…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 00:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df9b952edeca4da206645591f1e0c23 SHA-1: 6ae2f9978cb8c3ce9b362e0b9857a98ea7086b33 SHA-256: 67232e0958e2bd47c5eb496f3833cb759424a099a2ab3a544922c90c6fcef6e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used in SEO link farms to drive traffic to malicious sites. The 'SE_CLICKFIX' heuristic indicates the document likely instructs users to execute commands, a common social engineering tactic to bypass security measures. The presence of external URIs and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://mezovuduw.ru/strik?utm_term=how+to+delete+ntuser.dat+windows+10
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/guwuzatot.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_604d1fe4d82dd.pdf
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fdf305f8cc21.pdf
    • https://cdn-cms.f-static.net/uploads/4487662/normal_601b314d5df3e.pdf
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/zevofiwigomat.pdf
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ff6613fb1331.pdf
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/zinabibikiko.pdf
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5ff24bbb7ccb0.pdf
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/251be6970.pdf
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/3903994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cab3048d-6bed-4319-9931-7831196fdba7/93417557156.pdf
    • https://uploads.strikinglycdn.com/files/77922f7b-5fc9-44c3-8270-b08ed7b224de/jikabuletoviloga.pdf
    • https://uploads.strikinglycdn.com/files/83aa80c0-78c2-464d-b916-689e3c0e7f88/vuvazorozawilexexelab.pdf
    • https://uploads.strikinglycdn.com/files/31b86b8f-8e83-4569-9e2d-7453d8792d47/67378127348.pdf
    • https://uploads.strikinglycdn.com/files/4b092763-9d05-4d55-b912-663afa92a828/88988896096.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/megapolis_city_building_simulator_apk.pdf
    • http://lubelulezafi.rf.gd/jutadonupi.pdf
    • https://uploads.strikinglycdn.com/files/5f11b9b9-55eb-4561-b130-df5d9ba0342a/how_much_caffeine_is_in_monster_vs_red_bull.pdf
    • http://kejunem.rf.gd/electric_socket_light_switch_heights.pdf
    • https://uploads.strikinglycdn.com/files/4638dbfc-7112-4827-a533-0b410969f283/stihl_fs_76_carb.pdf
    • https://uploads.strikinglycdn.com/files/1e53feab-017c-481c-a1d4-cc4acd456c5d/nextbook_10.1_tablet_pc.pdf
    • https://s3.amazonaws.com/levumoduf/dog_barking_noise.pdf
    • https://uploads.strikinglycdn.com/files/2075f7b4-5839-47fc-a9c1-f1b0a946fa5c/lg_mini_split_user_manual.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_off0000f2ee.bin
3c9ae199bbf29507758e12d05cb08c615497365ad92e1d561c1af8e80295f330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 5096 bytes
font_01_sfnt_off00010462.bin
55b3a14e3c4501c4302a155d5b543fabe60bbe66f8845bfd23f3c5bc270b0573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10736 bytes

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