Malicious PDF — malware analysis report

Static analysis result for SHA-256 c104261e5cbbacd1…

MALICIOUS

PDF

72.5 KB Created: 2021-02-03 00:32:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: febd2a709650b0d3fac5398137ceedc9 SHA-1: 7501253799ea95dbcf5a031caac1dafdb245e280 SHA-256: c104261e5cbbacd1ce7fc5d11d3f66597ccb3edcc509b0048991adf8706ce5a8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/aws?utm_term=boomerjacks+menu+pdf PDF link annotation
    • https://nikigefewava.weebly.com/uploads/1/3/0/7/130775032/xorara_kopatajukojuzo.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/1809414.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/hdhf6hc/tegoxidibuwib.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/nggkagh/44201477838.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/waratasaperoganered.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/afebac4131.pdfIn PDF document text
    • http://orbitan.fun/dynamic_programming_and_optimal_controlgu9nt.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/hijdgiZ/super_car_racing_2021_highway_speed_racing_games.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/njcdjdA/74039471779.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ccihgjG/royal_enfield_meteor_350_brochure.pdfIn PDF document text
    • http://vwwv-avito.online/the_kingdom_robert_lacey3su95.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/hjdifPQ/44141557958.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/diiGeIQ/52372587.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/befafuni/29311589735.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/angularjs_bind_object_to_form.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/xusokasigosuvodadul.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/contusion_stevie_wonder_sheet_music.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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 5460 bytes
SHA-256: f107e45718acb339c92a3ab24b1e96a1b9d9c3e1bdf7857c4cbcd6a4b18226cb
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 11964 bytes
SHA-256: 801b26349ec869643b962f2193eeee8b5c02cdfd3346d063f6644c71fd1ef1f5

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