Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f334820e037ddc…

MALICIOUS

PDF

74.7 KB Created: 2021-03-12 01:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc6f552ec712d7522b907028ba92a3b8 SHA-1: de02aa84163fdb2b0abfd58e291e01f54e75153a SHA-256: 88f334820e037ddc76ed541b1ea1903ffa75fde049df7c62e476a915214a48cd
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score further indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=how+much+do+pimps+cost PDF link annotation
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/ad3493bee93c.pdfIn PDF document text
    • https://wimatuzufuduwo.weebly.com/uploads/1/3/1/8/131871585/8744779.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/guxak.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/tidegawisexoba-gagorubexelot-tawes.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/vidijutiw_rekutufil_fixifonaf_gujugibodaja.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/762d5f9eeb.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/17a7c7fcccf5.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/6114797.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/c4bccd9d8fb29.pdfIn PDF document text
    • https://votujejigep.weebly.com/uploads/1/3/1/3/131380583/tanivamawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2c9f3f-0107-45e3-8336-85227b5f32d1/nick_saban_process_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac62220-1100-4624-bac5-92d377cda55d/jenewebelulifatof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf9ae6b-58b6-4119-902c-4bde6fc73616/gujarat_staff_nurse_exam_questions_and_answers_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1f5cbe-8f74-4766-b0b5-f42fedcc15d2/semipera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3a2eb1-4d27-476e-a2c2-79a0a2f9cb87/thomas_harris_silence_of_the_lambs_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7021d6a3-ceb1-40fc-adf1-bb523956a618/16779430773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5af8925-99c2-453c-abd1-94334c4635da/aprendizajes_clave_para_la_educacin_integral_segundo_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648bdd63-0644-4842-a683-029eba766757/hp_officejet_5740_e-all-in-one_printer.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5028 bytes
SHA-256: 491e32d961d6888ede5b080a32adc7581c40f56e5a19006f37041822dc2bbf47
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 11236 bytes
SHA-256: fbfd2f9a08e5a272915f7b624028b290ce01e4891e4eb03ce4ae03e9001dc9e7