Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc18adb0c458911d…

MALICIOUS

PDF

66.2 KB Created: 2020-12-19 02:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c37ffc61d0bf7129b2ce08fcdbb9024a SHA-1: 7ae736e58877ee751a96c36afe1aa9f76238241a SHA-256: cc18adb0c458911d57faf6fe0590c6bb833c5295e7ac1746a641bd26f0aaaa7c
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to external PDF files hosted on disposable domains or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, but the presence of a malicious redirector URL and a large number of external links suggests a phishing or content-luring attack pattern.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/123?utm_term=life+cycle+of+star+worksheet In PDF document text
    • https://fasefipuronupa.weebly.com/uploads/1/3/4/4/134471496/04118016856b2.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/vogujupinozakekox.pdfIn PDF document text
    • https://digufotunu.weebly.com/uploads/1/3/4/2/134266503/939158.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/titiseganinol.pdfIn PDF document text
    • https://bakovumosu.weebly.com/uploads/1/3/4/6/134679162/silitadaro-watabafe-vufivijexod.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/c5440036914bd35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_5fdbe1411cf03.pdfIn PDF document text
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/9184144.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/dubiditiginowo/danny_s_song_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cffd620-6358-42c5-b308-620d06126020/gosujivanobalupubadi.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/98300711045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aee7c1f-fcc1-438a-962a-2d5f49e69f4e/11064461440.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/architecture_portfolio.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_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 5168 bytes
SHA-256: dfd1a782a511c0e6e03b36bc4e59d22fb7a8c7d5bdb8527013c88a7d201cec25
font_01_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10096 bytes
SHA-256: 5d26fa909bb8196a2675b9d08818b12ecf5d9d82d487c70fdfa9c18f24a29388

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