Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a379a4ee8680a7…

MALICIOUS

PDF

77.7 KB Created: 2020-12-29 20:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 458aafd11d071d107986bedf52b2b3f3 SHA-1: 2ca0403f3bb2b225bffbcf19ca4e28692ebe834d SHA-256: 54a379a4ee8680a7b754969d5fa19c158fce4d85a6a54b7ec21dacc16791685d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware. The presence of external URIs and the nature of the embedded content point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://trafffi.ru/strik?utm_term=how+to+install+custom+maps+minecraft+windows+10 PDF link annotation
    • https://wowupaxelisone.weebly.com/uploads/1/3/4/8/134856013/benegegebirub.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/dcd848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5fc5055d487f5.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/5796844.pdfIn PDF document text
    • https://cdn.sqhk.co/wiberini/jgrhgjd/wheel_size_number_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/RjbmiiP/how_to_fill_cube_shelves_to_wall.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/gasipus-wijux.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/Bjj3ibZ/75862586737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fa0cdbec4f75.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/tetazino/vapelukusaremutij.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 5548 bytes
SHA-256: 9336f1a007433ec07a882530d67b3222a726dcc8b9cdaaaf866312f830884cef
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 10264 bytes
SHA-256: 2efbd1c168653b9f63c8e2e45b8d4a20141515072adf9851ffbc828eb0553f15

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