Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b199da56fc6c989…

MALICIOUS

PDF

87.6 KB Created: 2021-04-10 04:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5dedc1dc579a4f6aa3495a08554fd0aa SHA-1: d903c9e46da8a963cf1cc994473d6230990e26cf SHA-256: 0b199da56fc6c98968c7ab8a8adce1b31c1ffd9bb8e17eec0ee7b7c460d07180
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=cual+es+la+metamorfosis+en+las+mariposas PDF link annotation
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/7487009.pdfIn PDF document text
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/zumuvud-javemutowepitej.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/9306564.pdfIn PDF document text
    • http://copyright-rules-help.com/gubanepizugogeweb461vm.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/batman_the_dark_knight_returns_movie_reviewps3t0.pdfIn PDF document text
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/wuzisuvabu.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/language_games_innovative_activities_for_teaching_english.pdfIn PDF document text
    • https://nedagipi.weebly.com/uploads/1/3/4/7/134724638/faneviremapi-vemekimiwa-wexejen-rixavav.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/apa_manual_6th_edition_ebook.pdfIn PDF document text
    • http://cadenalia.com/teburoraw5tuo.pdfIn PDF document text
    • http://ionatr.space/ferrari_458_italia_speciale27mbx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_16a03a7a5112496aa7cf1d421c4f2796.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_52402dd7f349442da2e049e0368c4ab7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/cestina_express_1_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/vendor_compliance_checklist_template.pdfIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_c6a5a70c4a454e57bc4f57f5c23b14ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/78177980851.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_1342ec39c51f4fe19c5d9fc03d043b53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukajevo/2612515667.pdfIn PDF document text
    • https://539b613c-a54f-4c74-97b0-41cdc0f13365.filesusr.com/ugd/f6e6b4_9f6c92605654401297cbcc08332f24e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/sennheiser_rs_120_ii_headphones.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4ef3366d4a9044a3817097d414b6b9a3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 4952 bytes
SHA-256: cbef4dc75f49937b09a49b1bdcbddcb0ae0867cf95971940a33d9e885d233a0f
font_01_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 13748 bytes
SHA-256: b2c0b0e887b8435736f9e6ed355b396ac142b1b910148725763a02d70f3d4dad
font_02_sfnt_off000140f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f