Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf026b9ec1e6a3f…

MALICIOUS

PDF

78.1 KB Created: 2021-01-31 02:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c21a96c50b6ca04065052b922b4e1ad6 SHA-1: 8efe246c0072930e4dadbd84298b1a1caa2d08b4 SHA-256: 7cf026b9ec1e6a3f322bceed9803c2e63c790a06f7a9c30f40a5dc078839dd78
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/aws?utm_term=honda+civic+2010+interior+manual PDF link annotation
    • https://cdn.sqhk.co/mezutorixo/VRudaeD/42275842049.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/tebezefapuvi.pdfIn PDF document text
    • http://myimperfectmomlife.com/avancemos_2_unit_resource_book_answersrxh58.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/fkAuhpb/rizepirubolo.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/KpQIhdP/age_of_conquest_world_apk_unlimited.pdfIn PDF document text
    • http://alexsaf.ru/degree_of_adjective_worksheet_for_class_4wqxv1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5fe021f45f0ad.pdfIn PDF document text
    • http://scandisvet.ru/libros_de_andres_torres_queiruga3p0fs.pdfIn PDF document text
    • http://axecheat8.xyz/catris_merge_cat_kitty_merging_games5eevx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5ffd306289e42.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/fFjfhba/femaxawukesasaperetoge.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
    • https://s3.amazonaws.com/zonivezada/goxunirukikiwab.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/yahoo_answers_pregnancy_and_parenting.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/almena_typing_method.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5136 bytes
SHA-256: 626f20534971926bf54d6f1022de8453f2caa3fd988aad13c1dce369d7c9ed93
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10368 bytes
SHA-256: 9e2b296137e3a23e8a8e84314f09865e5e3c2aa617708e544dcbe8658e4631ab
font_02_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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