Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8ea9a186f648e9…

MALICIOUS

PDF

65.0 KB Created: 2021-01-04 12:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ae513fa81f1e4239625d97719cef2903 SHA-1: 86819d0bdcee68d16e4e91acd9afd0441c563d05 SHA-256: ce8ea9a186f648e992e9a2144aec6146d3b55d9a56996865e20b728ab169d553
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or a phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?utm_term=britten+norman+islander+flight+manual PDF link annotation
    • https://cdn.sqhk.co/dudazume/FtgcUVu/lock_screen_wallpaper_on_iphone_6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5fb774847c633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_5fb80370969b7.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/9889394.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/XjgzTK2/zekotipukupugutalidolodu.pdfIn PDF document text
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/nakagovotejefiwebir.pdfIn PDF document text
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/322297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5ff0b17753ba1.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/jj8CibF/33286086650.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/S5DsBt6/dig_it_idle_mining_tycoon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5fb6d96a38563.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/tabobujimo/matasodewug.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/building_construction_lecture_notes.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_off0000b48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 5252 bytes
SHA-256: fb2048e448d0b14f5b709e94fd9898375f1db7429015593b751c8faba57c6345
font_01_sfnt_off0000c62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 10164 bytes
SHA-256: 2b4811a8cf9c5c365404009ba8922ae6aa7e07e9fdc1721c38b744cdd86a730f
font_02_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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