Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab1322938e23462…

MALICIOUS

PDF

84.1 KB Created: 2021-04-06 03:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d8530ecbb1a3e859b5931d9dc3ac9341 SHA-1: b5d6f20492d398d4ed479fc95800ca3176da554f SHA-256: 0ab1322938e23462b0c4fc5edab17b790464e88bad900102056f5fa01b64c965
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+importance+of+visual+perception+in+visual+arts In PDF document text
    • http://wuvilorilete.22web.org/60012800761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_5fea0ead241a9.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/tinujatibazapejonema.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/83472619573.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/55967376050.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/apostila_agora_eu_passo.pdfIn PDF document text
    • http://dinusedixiwog.iblogger.org/50784854245.pdfIn PDF document text
    • http://bunakevogipo.iblogger.org/what_do_you_check_when_buying_a_used_car.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_60453a42dcd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_6059207dd14a8.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/60395142239.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/4_10_by_10_coordinate_grid_paper_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_60108d4f6afcc.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/bifinin.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/holographic_laser_projection_technology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_600f3ccc466d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fe34dde92cb8.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/65249085808.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
    • http://kibajopowal.epizy.com/bye_laws_of_trust.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/81609217218.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/20276152719.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/tiwagima.pdfIn PDF document text
    • http://xuperag.epizy.com/wexuduvukagesoxeligiti.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/english_articles_grammar.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/calories_el_pollo_loco_tostada_salad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 5208 bytes
SHA-256: 87f862d288dba9b2ee9bcf00b4880f840a4ae95f8c3e78c1db7f15db5cc209c8
font_01_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 10900 bytes
SHA-256: a1228b731e23ce1031daa5df54e187b7ef96ca3b2ce0e12ba2dbe714ecfd71fb
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3