Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a6820905f58dc9…

MALICIOUS

PDF

139.8 KB Created: 2021-03-01 12:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cea64e22dc4856e02ff1c3f239283957 SHA-1: c8ba176bca409a295eae0944793822e5a5e929e1 SHA-256: 17a6820905f58dc964bde1d985c67bd6f82ed5080436be6594633c2f73561402
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to downloading a PDF manual, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm heuristics further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/aws?utm_term=descargar+turbo+manual+de+guitarra+electrica+pdf PDF link annotation
    • http://smartcreditscore.info/bissell_handheld_pet_carpet_cleaner_reviewshnpv9.pdfIn PDF document text
    • http://kinokaiff.space/rinnai_gas_heaters_for_sale_perthltyp9.pdfIn PDF document text
    • http://hookup153.fun/94874906527em0ay.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/virtual_lab_the_cell_cycle_and_cancer_worksheet_quizlet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5fdf66e3644a2.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/26139127168.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/safety_razor_kit_merkur.pdfIn PDF document text
    • http://myfavoritesun.xyz/xipuzipokokekepugifetoso9.pdfIn PDF document text
    • http://pro-komp-master.website/tajekejorazaderibadedofeg1lwx6.pdfIn PDF document text
    • http://santecmb-sarl.com/voxerwehax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403822/normal_60014b5ba1d5b.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/ap_statistics_chapter_3_test_review.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/what_is_the_true_meaning_of_the_name_christian.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/34525625531.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/karcher_pressure_washer_soap_instructions.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_off0001dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCF6 1780 bytes
SHA-256: 7b175729e8665116d436d916e15899b2da813b91edf3566bf7b687ec859430ab
font_01_sfnt_off0001e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E598 5612 bytes
SHA-256: 2923df9064c9fbf8d2e01f081fb040bf2222506a33d3843294c23f190d0e7a78
font_02_sfnt_off0001f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F89C 11508 bytes
SHA-256: 9a3aa565bd6ded466fc5f0d7d74d74351061b7b068b877f35f5fa3b1fffdb727

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