Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb0c5f61bdcee82…

MALICIOUS

PDF

83.8 KB Created: 2021-03-04 10:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ab0b6aa06668fc288afccd9a30d34aa SHA-1: 9535404631f26cc38a7ac1af97a424dbf698468b SHA-256: fbb0c5f61bdcee8251cb7b48a39649ebddcd1b5b0626bf07a9c3d600692fef85
126 Risk Score

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 0.9998

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://nipisod.ru/123?utm_term=what+is+the+best+budget+lawn+mower PDF link annotation
    • https://cdn.sqhk.co/pilozarager/c9gjiiK/fukas.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/bavodiwevuvo.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/triangle_congruence_test_answer_key.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/is_a_2009_toyota_corolla_a_good_car.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5fef3adc13e64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445541/normal_5ffa1b2660f6c.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/jexozumadi.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/2139695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_601e13f400144.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/how_to_change_font_size_on_brother_p_touch_pt-70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minapisifiret.rf.gd/is_a_harley_rake_worth_it.pdfIn PDF document text
    • http://dowinoxerirud.epizy.com/car_parking_games_free_for_laptop.pdfIn PDF document text
    • http://gipenebome.epizy.com/best_answers_strengths_and_weaknesses.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/abirami_anthathi_devotional_songs_free.pdfIn PDF document text
    • http://tumapaluk.rf.gd/53194194412.pdfIn PDF document text
    • http://pubaxazuwatixam.rf.gd/61413261340.pdfIn PDF document text
    • http://molodetagako.epizy.com/hello_my_baby_chordettes_sheet_music.pdfIn PDF document text
    • http://vujipuxi.epizy.com/florida_used_car_bill_of_sale_form.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_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 5484 bytes
SHA-256: 8ad5c68c81e9e2e59c012f592686e6a1eaf30ac2110fa5fb3badea92f258707f
font_01_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 10660 bytes
SHA-256: 1ee6f1a30e88f80510aec81feed382d722c1d2272fd0a7ae18b5331752164332