Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7664e962e45c00…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 12:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a16ac7f41e49ff26d33505ead3d684c2 SHA-1: e14f4db2b59c95010a2efe2ac02e94e3a5546074 SHA-256: 9a7664e962e45c00a954996cc2ec6ed3820aa1ae8771fc88d320b9d802913914
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lozipotod.ru/wix?keyword=best+kratom+strain+reddit PDF link annotation
    • http://saxozumipelezip.22web.org/free_game_beach_head_2002.pdfIn PDF document text
    • http://itslm.fun/best_positive_books_2020w2kvq.pdfIn PDF document text
    • http://mugedly.xyz/16581263565zmlio.pdfIn PDF document text
    • http://buyfastedcircle.xyz/how_to_tell_how_old_a_rheem_water_heater_is5650t.pdfIn PDF document text
    • http://pitushok.fun/89949085799kt0v6.pdfIn PDF document text
    • http://govnososal.xyz/21793993774ijvz0.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/1037247414.pdfIn PDF document text
    • http://vigastlens.xyz/how_to_use_an_ergobaby_infant_insert3f56w.pdfIn PDF document text
    • http://insurancesouk.com/sumupewexikoxatukopewegotsyo9s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54dbeb4e-768a-4745-b8ce-1e327ace4215/batasusilunonunamap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac1095f-cd18-46f2-bf44-1e78d6db5cfe/tragedy_of_the_commons_environmental_science_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79955a91-14a3-446e-8d88-744eac5432e6/how_to_clean_powerforce_helix.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/2012_audi_a5_convertible_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1f8437-7438-4a7a-a065-89633e3d35d6/how_to_calculate_total_surface_area_of_rectangular_prism.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/78508645663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5982f0d-efc8-4203-ac50-f61fb6bb7061/wahl_home_pro_basic_clipper_kit_uk.pdfIn PDF document text
    • http://sabuxixu.epizy.com/64876784029.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/tax_invoice_template_not_registered_for_gst.pdfIn PDF document text
    • http://xewenofos.epizy.com/zipepopelamuted.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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 5052 bytes
SHA-256: c69dfb1f87ddbd27e50e976c3aa64e79e9db8fbee1684afe910e219605f1e4d8
font_01_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 10684 bytes
SHA-256: 68ed45157ab34330767abcc147bad22c29e27f2991906f5a7f93a81afa1916ee

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