Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cb9dc818b500cd…

MALICIOUS

PDF

77.3 KB Created: 2020-12-17 13:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6932d8bbf9cb5e658e1c873922910301 SHA-1: 1711ca8a9af731d1397077c0037f54414ba2a037 SHA-256: d8cb9dc818b500cdfa18ccdd5cc07189dc2e63b24036ad6e4ce0288f7cc8baf8
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to installation manuals. The presence of multiple PDF links, some generated for SEO purposes, indicates a potential link farm or phishing campaign designed to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://cctraff.ru/strik?utm_term=trane+xe80+installation+manual In PDF document text
    • https://lukejofavum.weebly.com/uploads/1/3/4/4/134455809/6641157.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.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/1fe9e2bb-9f17-4c72-af63-faf292622509/download_m-audio_fast_track_c400_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/92581909776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280d5037-dd5d-413c-920f-ab39c2382064/mexefox.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/gb_whatsapp_7._20_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/doluweze.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef95cc750a3b5a04de20/1606217621988/kul_tiran_engineering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/vawazuwutanixor.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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 5184 bytes
SHA-256: 02e9a15d0ec5d079e6ff82971bd4d6ebb4863ae9fb3e909f163943e5ab45bef7
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10964 bytes
SHA-256: ef70fa0ca2689659bf077e2cffa7564b97a633d89431b3e84bdd48ffd9e58423

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