Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03607f2f447b5a9…

MALICIOUS

PDF

95.4 KB Created: 2021-04-06 14:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c059330e365bf839ce9af0a609f66566 SHA-1: 1a9589d7610432bca4331eab40d96ffdadbfeca6 SHA-256: c03607f2f447b5a9a4dae1d74d2f8eca05cd8d2b760145c8f16a2f9effe4a3f5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://leonvi.ru/123?utm_term=angular+8+form+submit+example PDF link annotation
    • http://laserisesiseno.getenjoyment.net/subtracting_integers_quiz.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/tedanofogobifijodegegawal.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/82405054833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5ff06e80acc43.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/what_are_the_10_largest_cities_in_germany.pdfIn PDF document text
    • http://mesugowogidevik.iblogger.org/face_shape_guide_for_hairstyles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_6028a181b3a2d.pdfIn PDF document text
    • http://domifonupesif.iblogger.org/43953143452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_6068383a00064.pdfIn PDF document text
    • http://xijonope.iblogger.org/smoothie_recipes_healthy.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/sipudeteno.pdfIn PDF document text
    • http://favovuzoxegavix.22web.org/74070278476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ff3f680015e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_6054255876c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5fd0e4005dfaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fdd40479bd52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f02d11-4d4a-4442-ae5d-17d420041f73/59363371586.pdfIn PDF document text
    • http://vuwoxakex.epizy.com/office_of_inspector_general_detention_center_report.pdfIn PDF document text
    • http://lasakarafivof.epizy.com/21039444933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13789cf3-4a59-4560-a9bf-74fdebb7dde0/poulan_pro_pp5020av_factory_carb_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b442db-2205-433e-afd5-f0a452f87efd/quadra_fire_pellet_stove_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f77666-256c-45ab-8cc9-6129cd2da9d3/how_much_is_a_mega_neon_fly_ride_dog_worth_in_adopt_me.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_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 5612 bytes
SHA-256: 5cfcd81ba9b2f8441b82a5f55635730dd84b3441a1d874ac9f7a4cdc9dc528e1
font_01_sfnt_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 11788 bytes
SHA-256: a3c2bf5e43728be45fee7b0d708c419cb47249329bde667b0c21fa06c65c358a

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