Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c00e852d340a22…

MALICIOUS

PDF

91.6 KB Created: 2021-03-16 23:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8d7d4993fe43132122ce3fa506d6da19 SHA-1: 9546ba8a0189ac88375246394096712b25759cae SHA-256: d1c00e852d340a220c5ebb2f977d152d998fbfe7591b2253eca9b00cf9c3b25d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=curse+of+chucky+tamil+dubbed+movie PDF link annotation
    • http://uplrezina.site/tusejulivejabisaxudawaxuvqhez6.pdfIn PDF document text
    • http://kekanavaresem.iblogger.org/suddenlink_cable_tv_remote_codes.pdfIn PDF document text
    • http://reduslimitalia.site/b._com_part_1_result_2020_karachi_universityzb6bm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5fe4feb48228e.pdfIn PDF document text
    • http://nickned.me/how_to_build_a_vertical_charcoal_smokerjtehv.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/egjjcps/35390747606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_60369041ed5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_603fee23df843.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/jhhhshe/silver_dollar_city_christmas_lights_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/simple_algebra_substitution_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/corbin_russwin_ml2055_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/drip_irrigation_system_design_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/bible_for_pc_windows_8.pdfIn PDF document text
    • http://tokafibalo.epizy.com/dispersion_action_photoshop_cs6_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/27941024808.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/bigezutikedadan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 3400 bytes
SHA-256: 6ba457d65b3c8872cc4dbae995c1f955f8d95c34c0ec9f0c316cc5d0bf6d8239
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 5532 bytes
SHA-256: 75f27be4d141beaaea22a5fb6490cc23e8b78f2e6d486434c082d1fb0ac32ba2
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 12608 bytes
SHA-256: bd079804e176efc8086a6cc83aba1f30e22f76c97ad7cab6a7bfbaaaf600bbce
font_03_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 12492 bytes
SHA-256: e0a6306932526bcd1b9d52b67fd81d18bf8b7aa38986489ccbbb0e6e00b356d9

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