Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc53c91cd015c1b8…

MALICIOUS

PDF

80.5 KB Created: 2021-04-16 23:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8466ef031483196b61e9f1a88330be34 SHA-1: e142b46689268ade5b810dbfff0d2c07e2d821fe SHA-256: dc53c91cd015c1b852f3f52b3657c78a9682ac289c24c256f2d5516bec2988b6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to 'nhl records 2016-2017' and authoring information from wkhtmltopdf, which could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=nhl+records+2016-2017
    • http://nanonewe.scienceontheweb.net/practical_palmistry_narayan_dutt_shrimali_download.pdf
    • http://bio-ita.fun/nikon_prostaff_3-9x40_black_matte_riflescope_bdcdd3f6.pdf
    • http://straponartist.com/86677965368w4812.pdf
    • http://dfahsdfgjsfg.online/exercices_verbe_avoir_au_presente1ils.pdf
    • http://fexevewuli.mypressonline.com/egyptian_gods_and_goddesses_family_tree.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://batmbatm.ru/l_alphabet_militaire24059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fobapisarut.epizy.com/low_cost_housing_project_report.pdf
    • https://s3.amazonaws.com/nimuwet/knack_2_platinum_trophy_guide.pdf
    • https://uploads.strikinglycdn.com/files/bdd1beac-5945-4cd9-b526-1b9262e76286/how_to_draw_modulus_function_graph.pdf
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_a56c82fe2b824ec9a7dcc5bd3e78418f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74842e8d-cd4b-43f2-adb5-7821c49fbd18/mapa_conceptual_de_los_6_niveles_de_lectura.pdf
    • http://lekinorigilitu.rf.gd/personal_fitness_merit_badge_worksheet_2017.pdf
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_15aac473c8cf4bf396a393a3e48e3c24.pdf?index=true
    • https://s3.amazonaws.com/rubidokezive/capitalism_lab_strategy_guide.pdf
    • https://s3.amazonaws.com/voropa/dungeons_3_mission_guide.pdf
    • https://uploads.strikinglycdn.com/files/870264f2-3049-4fa6-811d-284612758016/zumalevapagomamixenosex.pdf
    • https://uploads.strikinglycdn.com/files/8f8707f0-814a-47d9-8ee4-0c570a63622e/seiko_solar_chronograph_v172_battery_replacement.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc70.bin
b698ec079eaa94ede7c81aea6cf8291093547751fa7a9209588d57da72c02ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 5380 bytes
font_01_sfnt_off00010ed1.bin
53cf289d1abff8ca9b259a53a924be677969252d2288387f8a4850e2a5cc80c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 10876 bytes

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