Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b9456abf472df2…

MALICIOUS

PDF

104.3 KB Created: 2021-01-13 11:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dcffff62ba8f8d4ca6fc772eef205f0f SHA-1: 763a085dcb5db598aeb89eca45689134b6000a80 SHA-256: d5b9456abf472df20ed67521f41f81486b464d3bb8ef536a64091d4ee1ba814f
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a redirector link to known malicious infrastructure. Additional heuristics identify the document as a link farm hosted on disposable domains, further suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=ranger+bdo+guide In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/zofumevovupa-laxedu-zasigez.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/danulozeko.pdfIn PDF document text
    • https://cdn.sqhk.co/mimotulifoti/GKb4Xhg/ziwedejowijivokiletisov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5ff5f7c7cd005.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/d855b8b6f.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/ba2jfKm/tetutafekoniwejozo.pdfIn PDF document text
    • https://doxiviju.weebly.com/uploads/1/3/2/3/132302912/vafemudoxalifufipego.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/tutapaxi/xugidololinamibo.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/form_1_mathematics_questions_and_answers_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/chudiyan_pakistani_hd_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/free_ks3_english_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/area_do_losango_exercicios.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_off00015d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0B 4928 bytes
SHA-256: 36e8d362af9f3482d5b4f447f2ba3bf9f75ee623b8d95218277efea02b9f6b7f
font_01_sfnt_off00016de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE1 11188 bytes
SHA-256: a49c6253e6d135430a46df542ca8307593cb52c59dd6f0190ade8ffe0ff5dbac