Malicious PDF — malware analysis report

Static analysis result for SHA-256 a150ffc2bd385aab…

MALICIOUS

PDF

110.4 KB Created: 2021-05-31 03:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0d32e523e2191e3d20cbc593344a1a56 SHA-1: 65bcfee334d60ed62ba0b96c824da79ab6367264 SHA-256: a150ffc2bd385aabf709750c74796e87c4d9c2b7056199dee337cb60910cd5ef
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of external links, suggesting a link farm or phishing attempt. One of the primary URLs identified is 'https://kuzutuzo.ru/strik?utm_term=free+happy+new+year+2020+images+hd+download', which likely serves as a lure for malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=free+happy+new+year+2020+images+hd+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465941/normal_601be19aead79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409239/normal_5fddbafbab009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_6058414e3ecb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6039a30c324c5.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/8a7444fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6041804388958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fce4bddb9e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5fff3a08c08c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_604fc103d76b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_605b70b526e9b.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/54a33ca6763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_6065666d73fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_60291c549dc33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd44c1ce12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fdba5302760c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5fc69d4ae92da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6023739638ebe.pdfIn PDF document text
    • https://nerolokem.weebly.com/uploads/1/3/5/3/135326062/8109278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fc9c27-ebdf-48be-b136-fdf480e8959d/how_to_do_scoliosis_surgery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d0f697-4f17-476d-9b2e-1257fbb8af9b/what_did_muhammad_ali_say_after_malcolm_x_was_killed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3211ab7a-ca45-4ca5-abf0-cee50a544b47/what_are_the_tools_used_for_digital_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ac4b38-23e3-4988-8d1d-5ab1432c019a/examples_of_critical_thinking_questions_in_science.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FD 5796 bytes
SHA-256: e95a5f6346a5c6d71bf7641da0727c73efdcbe727ea53619f16bd0900f091e7e
font_01_sfnt_off000159a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A9 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off00016509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16509 10456 bytes
SHA-256: 3302c3ef9185cc9a1571a0c3152fbe9cf429428b24c59f83ef0553d9e6407221
font_03_sfnt_off000188e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E5 10896 bytes
SHA-256: 94fa8ceaddef6ce301129e82bff27f5aca7372f0d2800a80fb32aaf7b485e440

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