Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf070370c0cd93a3…

MALICIOUS

PDF

82.9 KB Created: 2021-03-10 01:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31c9f2ca53e3979cfeb2271e458dc8b0 SHA-1: 69a84619a84f2c54c64c8d5f67f7f02eb424280e SHA-256: bf070370c0cd93a328232152be196d83004b3246ad3aa7440b1f04c97d77a69f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identifies it as a link farm on disposable hosting. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=ancient+greece+artifacts+found PDF link annotation
    • http://raisinshub.club/25502970220ak48p.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/how_to_write_a_case_study_proposal.pdfIn PDF document text
    • http://bobr.space/309116247978s8zu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481170/normal_5fe0dfaa51036.pdfIn PDF document text
    • http://idealica-uficiale.website/burger_shoppe_wake_forests8g6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_603a50647a717.pdfIn PDF document text
    • http://formverifiedbadge.com/frases_del_curso_de_milagros2fuel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_602fb50bdff4e.pdfIn PDF document text
    • http://odemebayisitrafik.com/six_impossible_things_before_breakfastijsur.pdfIn PDF document text
    • http://domastmsk.space/cara_video_di_twitter_pada_iphonev8fa4.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/autocad_2d_furniture_blocks_library_free_download.pdfIn PDF document text
    • http://goodsun.space/california_politics_a_primer_freesds2u.pdfIn PDF document text
    • http://tradestaroffice.com/43272196279dagcp.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/microsoft_project_server_2013_end_of_support.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/pegebunov/computer_hardware_engineer_degree_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/25255440494.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/61055208979.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_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 5144 bytes
SHA-256: e36ef1ef32ad0b57442859f2e174f977b90ac8d5b158f243395f3d85a987bc8b
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10396 bytes
SHA-256: 5ba11a72c2ca242224f943b4db0c5d9157c22866f97a3a86134a58506f5e8fc4

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