Malicious PDF — malware analysis report

Static analysis result for SHA-256 4401a8e1878d6afd…

MALICIOUS

PDF

79.6 KB Created: 2021-01-14 10:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f60e301c60ea98d91ca6129d0d94d6f7 SHA-1: 3d0fa784b84ea51a27149edaad6effa3dd08ad35 SHA-256: 4401a8e1878d6afd7e3bf8429189999c444fd6640a4819eda995feba4e6f2f4f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link and a PDF link farm, indicating an attempt to direct users to malicious infrastructure. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution vector.

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 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://gettraff.ru/aws?utm_term=backcountry+movie++free In PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/how_to_change_lock_screen_wallpaper_iphone_6.pdfIn PDF document text
    • https://site-1176636.mozfiles.com/files/1176636/nuzomopevixi.pdfIn PDF document text
    • https://site-1246349.mozfiles.com/files/1246349/41970504648.pdfIn PDF document text
    • https://xukolewijox.weebly.com/uploads/1/3/4/3/134320036/jetemifuzin.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/biiiaRA/shareit_app_for_pc_windows_10_64_bit.pdfIn PDF document text
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/4717782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gogunabones/nuvifab.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/osrs_restless_ghost_quick_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/zozewo.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/emotional_intelligence_2._0_travis_bradberry.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/response._contenttype_application_vnd._ms-_excel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 4972 bytes
SHA-256: 1f7898487576ea0c64e35749ba97a8e946245d4bdac2492e06ab5cf06fe2a3cd
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 11260 bytes
SHA-256: 5bc0f6fc8d0edff92c98192f54c17a0c8114d5782e8a4eb42c560e5ae3f4d970
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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