Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faec6f33bdb539c…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 22:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2601f8f56b21099adfd55bd754e41a82 SHA-1: 5cf6072631d35a5dcd60d8b55505dfa7b8966fac SHA-256: 3faec6f33bdb539c691cf8a0c0ebb7818b28876aeb8686766a48ec73dc437a15
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to salary inquiries, suggesting a lure to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=how+much+do+agricultural+managers+earn+in+south+africa PDF link annotation
    • https://cdn.sqhk.co/fetadupozo/dhpujcs/du_screen_recorder_for_pc_filehippo.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/who_manufactures_sears_snow_blowers.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/i2edjan/truecaller_app_private_number.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/una_pulgada_cuadrada_a_centimetros_cuadrados.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/petsafe_shock_collar.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/55753462437.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/hsjjghO/api_platform_default_filter.pdfIn PDF document text
    • http://fevozogu.iblogger.org/examiner_report_edexcel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuronixo.rf.gd/personal_letterhead_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b0d8e0-d0ab-45ff-bbf9-00ddaa45d7bd/minn_kota_riptide_55_t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4754fa77-40c7-4d50-992e-4abc8092bf36/snapper_pro_s200xt_parts_manual.pdfIn PDF document text
    • http://kubuxakul.epizy.com/16175398184.pdfIn PDF document text
    • http://javozajesaretu.epizy.com/40946978066.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/58805321309.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/human_resource_mgt.pdfIn PDF document text
    • http://tagozenumuzem.rf.gd/pegijumakawelonate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bed288a-f45f-4d5b-9690-2f04b52c022c/16119483447.pdfIn PDF document text
    • http://purabozol.rf.gd/arabic_language_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/demon_hunter_dps_guide_8._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa69c80e-a6fe-446e-ba10-7e39e3e81a88/where_can_you_buy_kenmore_washer_parts.pdfIn PDF document text
    • http://wekujugom.epizy.com/jogo_de_dama_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/dezenegujevokofojezizoze.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5488 bytes
SHA-256: 00be9ba428ff075cf85abd3374a358c41b6e5151495ad8e5aa3c135aae66641a
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 10672 bytes
SHA-256: 40f01381a907137d4091b9e71cca3248ddda698bf145717bc4a83b176ea75e77

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