Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f5f9f3258b5a68…

MALICIOUS

PDF

77.2 KB Created: 2021-03-12 15:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 33f80aa9208afa42c27428aeb1ac51e0 SHA-1: 7a1394007c2b9a58dc9729b01d7485cbbb81f9f9 SHA-256: 65f5f9f3258b5a68aa2f80ea7a81f26e659a1912b5fbf61871afa03612b9e207
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://soxebez.ru/strik?utm_term=how+to+fix+a+dryer+gas+leak PDF link annotation
    • http://berkeciftci.net/gegudurunizafunapumixewfub2q.pdfIn PDF document text
    • http://tejajugumoneton.66ghz.com/novuxu.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/c89d419adb4bb6.pdfIn PDF document text
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/7718434.pdfIn PDF document text
    • http://fruitik.space/24117630045ct37r.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/jozada.pdfIn PDF document text
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/2238831.pdfIn PDF document text
    • http://eurofamily.pro/renosunavrrm.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/pasoravatazo-wakibazaza-zinuru.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/resetavumojulif.pdfIn PDF document text
    • http://kalavar.xyz/12983758465h44p1.pdfIn PDF document text
    • http://kemytbok.xyz/kyocera_taskalfa_2201_printer_driver_windows_10_64_bityx7zt.pdfIn PDF document text
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/75f8177d21a.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/jipowumat/naval_correspondence_example.pdfIn PDF document text
    • http://vinodek.epizy.com/tefupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aec654-4133-4f7a-98d7-5219b536ba47/who_makes_the_kirkland_signature_9.0_hearing_aid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cac5b7-80a7-44a5-b8ce-9022512b0969/53091900695.pdfIn PDF document text
    • http://livivisobozi.rf.gd/who_make_danby.pdfIn PDF document text
    • http://mopezuvo.epizy.com/adobe_premiere_pro_templates_free_slideshow.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/confirmation_of_employment_letter_template_south_africa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 5360 bytes
SHA-256: 5f31b78e7f32ecf2dc78c34dd71e213b4981e1e1723dd7040d2e6e3618c844e9
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 11000 bytes
SHA-256: 488d2d08a4bd65d27fa2a7332f86ca24ec5b5857e6f7fb4e0ab5305fa91e6fc0