Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f497b7f2a41d53…

MALICIOUS

PDF

79.1 KB Created: 2021-04-04 07:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bf6473273da2b4f28b3ceddd748caba5 SHA-1: c31be986003a4fceb804555e6e1a67636d9cf3c5 SHA-256: 17f497b7f2a41d531e8947b0cb4b198385ba5cb9cb8af067611b72c5a1f6ede0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to contain metadata rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://moxipafuxoxo.mygamesonline.org/cerebellum_histology.pdf In PDF document text
    • http://danoguvokapijof.medianewsonline.com/west_pulmonary_pathophysiology_download.pdfIn PDF document text
    • http://picply.ru/r6300_v1_vs_v2uktv5.pdfIn PDF document text
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/bisikise.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/miniwarewapotegasolakelig.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/how_much_is_a_pole_vault_pole.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/wanupezusemibod.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/reritifekekurid-rigabusajujisi-lakifesogotedeg.pdfIn PDF document text
    • http://registrat.space/22037186790by2vn.pdfIn PDF document text
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/9494797.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/free_forklift_certificate_template.pdfIn PDF document text
    • http://mugatazujiririv.iblogger.org/speed_queen_washer_best_buy.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/nelegole-mozomabamalida-latalanikav-nijobibejunogof.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/jofowokalokodufipor.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/list_of_irregular_adjectives_in_english.pdfIn PDF document text
    • http://wdd13.ru/spherical_harmonics_lighting_githubii44r.pdfIn PDF document text
    • http://sewiximafa.22web.org/setofojal.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/sumonawitanifigiwedozlp9n9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=star%20trek%20the%20next%20generation%20season%202%20episode%2016%20castPDF link annotation
    • http://xakagigoneliv.myartsonline.com/how_does_99_year_lease_work_singapore.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/astro_a40_headset_manual.pdfIn PDF document text
    • http://dubovusikiwafaz.epizy.com/hp_laserjet_p2015dn_led_lights.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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 5876 bytes
SHA-256: b3c00dd0279e3ee692c4cf75a7b0af80090325f11f064ba97c5214a57d525e95
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 11112 bytes
SHA-256: 631db0dbfb932fb406e2e4b7af64d4a098394b3388e19e59c0d711b199c24c1b

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