Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a048e0b95acac7a…

MALICIOUS

PDF

73.0 KB Created: 2021-02-28 07:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02aa868707327fe8b541335dec872725 SHA-1: 5727f09e0582acb28c991137c1d833f5d0c77653 SHA-256: 4a048e0b95acac7ac7ee5c9347b1f966c9b394db0c9122d50135a008ed9805a3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=how+long+do+you+leave+splat+bleach+on PDF link annotation
    • https://wipikiriku.weebly.com/uploads/1/3/4/6/134696444/fac1b9ad492.pdfIn PDF document text
    • http://istlan.space/refractive_index_of_prism_experimentm0ae9.pdfIn PDF document text
    • https://javabudonoban.weebly.com/uploads/1/3/2/6/132683403/f7004b3e4.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/lisakaj.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/38260153967td6kv.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/fosulepijujunotifed.pdfIn PDF document text
    • https://gawaratanos.weebly.com/uploads/1/3/4/3/134339439/fuxorawit.pdfIn PDF document text
    • http://sethel.xyz/566453689830771t.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/adelaide_tv_guide_for_tonight.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/db3e8a3.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/xenavuxa/36702355333.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/13035409224.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/nudifosumezafubarososaxu.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/9780397872.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5596 bytes
SHA-256: 82305e6a5f1847e07cd22bd448d63ccbb0fa91082dd0ba07e33ec951ed2bb10f
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 11468 bytes
SHA-256: e356da0fe8db5d93f8c712a0248a37c3a8aca3c5aad22dc0bc798c717ab33bc3

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