Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58b465ee3fd1207…

MALICIOUS

PDF

65.7 KB Created: 2020-11-27 15:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70c83db5b09294bffcf5632feb521aaf SHA-1: 666ea92ff766e485851cc35f6c2fd97e6168f58c SHA-256: b58b465ee3fd120771e632407aff069345db663efd40eb3da24b73e4c451f776
192 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a 'download button' lure and the ML classifier output further support malicious intent. The document likely serves as a lure to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=rearrange+pages+in+word+2019 In PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/vidigukaxavofona.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/aaa1b366bd7fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f9d656f192d5.pdfIn PDF document text
    • https://bexizesuxeneze.weebly.com/uploads/1/3/4/6/134634073/fd4b0e566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5fb014461ea45.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/palunuvogomasi-buwobi-koluwebiforine.pdfIn PDF document text
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/bf578c3e.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/7dec06e1-2053-4b30-b3e2-6eefd3ff65d9/free_mp3_download_immortals_fall_out.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/forma_de_usar_minoxidil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad8151d-fd3e-4352-83c1-3724d03560f5/milidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ff94cf-b4c3-43c4-8d83-3c6caca4da3a/usmle_world_step_1_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/xugexatigatinuxuger.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_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 5676 bytes
SHA-256: 54db2f4f15796e8f1fbf3b3699a28c4f55c2efc5f987bab398e827c2a892f07a
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10332 bytes
SHA-256: 91f1949c73b4b2f55d845e856abc85f26d0d2548e1cbcabbe3045a77d03288aa

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