Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff5bb6da29fb352…

MALICIOUS

PDF

82.9 KB Created: 2021-04-01 00:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 52b18fa7763a3c8474fdf6bf452fd44a SHA-1: b07dd9f5d9dd4a17d827f1bba25337923fe50e51 SHA-256: bff5bb6da29fb352095453589981e78eccd3f02e1c5e255a99e72d46a2d85e9a
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' in one of the URLs further supports a phishing or scam-related lure.

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://midufefew.ru/strik?utm_term=what+is+the+meaning+of+the+road+not+taken PDF link annotation
    • http://samafutanub.mypressonline.com/watopaseperotibitinolawet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5ff20b2d19862.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/ethical_hacking_course_in_delhi_after_12th.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/visidozakafet.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/marriage_and_divorce_in_islam.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/english_grammar_test.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/amharic_books_free_download.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/74233896216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_6042001fa3704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/revelian_cognitive_ability_test.pdfIn PDF document text
    • https://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_411059a43b9b46aaba1418a6962c8dda.pdf?index=trueIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/10228094120.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/colibacillosis_in_calves.pdfIn PDF document text
    • http://roveramo.atwebpages.com/48734132027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9095d0f4-bc4e-4fb0-ab16-a1c86b70352a/nebakaz.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_ab0af1fbdb0b4bbaa37d18959d4c9901.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ceb6db-1933-4548-b3cf-0f0deed8440a/how_to_get_a_free_ti_84_calculator.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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5364 bytes
SHA-256: c6ded81ac0ea265d961072795d12238afe99d63c94fa91c0fd761ddc752299f2
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 11740 bytes
SHA-256: 6b067c111f9476d5c972935c5c839e0bcdff7c279e6398371c3fb12302b24fe7

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