Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf7751627d734bb…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 09:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 554e7470f86d35127f3f261f1f258d37 SHA-1: 0a09b72c3e48ced6db6784a6ac04ed976480b3c4 SHA-256: dcf7751627d734bb06aa7af7fcd8e6dba38937846317d522e1220db0779cf54f
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 pointing to disposable domains and hosted on services like Weebly, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URL 'http://hookup755.fun/33475277921bl6gr.pdf' is a critical indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/wix?keyword=export+google+photos+to+hard+drive PDF link annotation
    • http://hookup755.fun/33475277921bl6gr.pdfIn PDF document text
    • https://mexekujiwununiv.weebly.com/uploads/1/3/1/4/131407761/referejubexuju.pdfIn PDF document text
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/b3c30dd.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/Lihagj3/computer_repair_job_sheet_template.pdfIn PDF document text
    • http://dezlice.ru/download_my_aadhaar_card_by_enrolment_now67d9.pdfIn PDF document text
    • https://cdn.sqhk.co/tikexumivu/hyshcnt/nick_mullens_agent.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jagcriq/australia_parks_and_wildlife.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/1961893.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/tuzekaxibitaruwi.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/vekivi-zujutudawosuz.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/fighfhg/read_music_faster.pdfIn PDF document text
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/vaxorunurokoli.pdfIn PDF document text
    • https://vijativu.weebly.com/uploads/1/3/4/5/134597759/4542816.pdfIn PDF document text
    • http://tiktokhd.design/hoja_de_balance_de_comprobacionpb742.pdfIn PDF document text
    • http://pollsexpert.com/zafererjn76.pdfIn PDF document text
    • http://marketop.club/butaxiladatatefuvebujopij200ma.pdfIn PDF document text
    • http://mon-fortuneo.best/gavinadewaletulazoludxqd7.pdfIn PDF document text
    • https://zavutotarewif.weebly.com/uploads/1/3/1/3/131379951/75208.pdfIn PDF document text
    • http://detonic-ordina.website/semi_circle_centroidzqxjh.pdfIn PDF document text
    • http://livethailand.fun/the_forty_rules_of_love_book_in_urdurq1bv.pdfIn PDF document text
    • http://bluebadgeapproval.com/93423237575jw1as.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://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_f14091725950425a92aa5f99ab17b0f6.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_ff0d16a89b3a45609036995d13897d86.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_91a8e4f0f8fb4013a71d0bdd4e5178de.pdf?index=trueIn 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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 4988 bytes
SHA-256: e0450f69e19a102193f29ad353014b161fbffb9cd4ae9c11cd0ab688a488488e
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 11020 bytes
SHA-256: f7e8f1ceabc6e4d3018d5b245faedf99fa10159db5d857742912cd1791aa7358
font_02_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230