Malicious PDF — malware analysis report

Static analysis result for SHA-256 495bf9c23d9e343a…

MALICIOUS

PDF

147.3 KB Created: 2021-02-26 05:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fd8fc71e221584f4ff3ae29445e9b0f7 SHA-1: ac522d553d24f6e7e8ae3b1be3a112dec8f13d3d SHA-256: 495bf9c23d9e343aa2723a99fb6e2e2dc4fcd2b864898349d3e1d8e74166f906
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=what+are+the+four+senses+of+taste PDF link annotation
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/8373c1f427f73.pdfIn PDF document text
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/8164571.pdfIn PDF document text
    • https://mexulurobe.weebly.com/uploads/1/3/6/0/136057308/02ff0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421335/normal_5ffbc4e16a610.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/7b558e155e950b.pdfIn PDF document text
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/xipagox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5ffcf7027e3de.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/busenos-velik.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/tizor.pdfIn PDF document text
    • http://sberbank.services/93994135287oyk4q.pdfIn PDF document text
    • http://i-men.ru/867083596758scvq.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/8448951f797f.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/betebuwusoris.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5febc4dbf34f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/wuvugibozudulovav.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/75797737403.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/fexexike.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/zurus.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/tecnologia_assistiva_para_surdos.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/chrome_address_bar_at_bottom_android.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/91861241644.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3F5 9652 bytes
SHA-256: ef5a9dd188f14d4ac7fa4dcaf0115c8751c53c2eaf94a93bd858b5498fc6aa69
font_01_sfnt_off0001f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F438 4836 bytes
SHA-256: 9b6acb16285ca3a4e34b8e89dbfacc9cee9d336002bf708a4ae4c88753578fe8
font_02_sfnt_off000204ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204AE 12336 bytes
SHA-256: 4b9c0bbbd95954e15a9bf47a5b946d9b7ba86fd7f3daf26205de019a26893e7e
font_03_sfnt_off00022db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DB0 6576 bytes
SHA-256: de31c32b25a4dd13087f860b9a9574720f67be041102057e87a1b8b19f6aadb7

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