Malicious PDF — malware analysis report

Static analysis result for SHA-256 a168e6890ef202cf…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 17:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1080ab2ffb4ca9afe41a05176bc95ee5 SHA-1: 22627c2cb7f39598ad640e00b31358f1d2129d56 SHA-256: a168e6890ef202cfef38b5b19e71335e6191ec993789db8c0df36da5efa9e93a
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 PDF contains numerous embedded URLs that point to external resources, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/aws?utm_term=5000+bible+meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fee65ec562ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5ffa39e251243.pdfIn PDF document text
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/2435153.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/fll_core_values_questions_and_answers.pdfIn PDF document text
    • http://smeshnoykir.space/mejixobuwu7mpjt.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/6972382.pdfIn PDF document text
    • http://jakartapro.xyz/programming_computer_vision_with_python_oreillyl1z2e.pdfIn PDF document text
    • http://belkwigs.com/jason_and_the_argonauts_free_movie_20001u40k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_6045155ed6429.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/4685614.pdfIn PDF document text
    • http://pollsexpert.com/how_to_connect_dish_hopper_to_ethernetkjbn9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409122/normal_5ffbcf662ea11.pdfIn PDF document text
    • http://wtia.space/85282501784is7dr.pdfIn PDF document text
    • http://profyhouse.ru/96964082794l2h18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/adjective_and_adverb_worksheet.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/fepatolidetadefa.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/compare_and_contrast_mitosis_and_meiosis.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/46072686861.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/boxer_animal_farm_quotes_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/bemisejajelok.pdfIn PDF document text
    • http://nidajoxof.rf.gd/fovorekanelom.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 5044 bytes
SHA-256: 120ed7eba4e47876dd03103d4e07e1aac221fa350f2236087922698a2430a32d
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 13240 bytes
SHA-256: 33dcb903596811a515d25ca728c7c13c8fda677dec062d7495b6791dfede80e6

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