Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06f00cd517e4665…

MALICIOUS

PDF

138.7 KB Created: 2021-03-10 18:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4e6a01651602aa3945a01f14042004f6 SHA-1: d9ed641c5ca6d0e79916f549f89e20e1607abf34 SHA-256: c06f00cd517e466528793799ee38290e69686d46c35fa10d38bf69afda631807
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the document's structure point towards a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=11th+biology+book+pdf+download PDF link annotation
    • http://voirlo.xyz/padixegi6fth3.pdfIn PDF document text
    • http://hotsales-com.xyz/pawaxejigugor1e9y2.pdfIn PDF document text
    • http://clipshd.design/can_office_2010_run_on_windows_xpsepe2.pdfIn PDF document text
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/2775889.pdfIn PDF document text
    • https://kazoxinajajidu.weebly.com/uploads/1/3/2/8/132815758/e8f29ba37fc.pdfIn PDF document text
    • http://italia-doc.space/a_writers_year_365_creative_writing_prompts0x9tr.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/1240485.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/vonipenijuka_pepag_gowuwitujuvatuk.pdfIn PDF document text
    • http://verifybadgesbusiness.com/anime_face_maker_go_free_apk52x58.pdfIn PDF document text
    • http://fbcopyright-center.com/goanimate_for_schools_character_creatoritx7l.pdfIn PDF document text
    • https://babejogoj.weebly.com/uploads/1/3/1/8/131856270/8119056.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/b3625cd9-ce2b-4c80-827c-f01f2e2ca4a5/90993562706.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_b3ca0ce6169844bba4b79d186879cf88.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_0ca525efb41b4ae3901833c3a2bb220a.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_dad01c4cfd4741aab5cbd642a1429d78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/vofamiwewofivujadab.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_63870b3b4f1b4585879ba32287ec912f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b7ef01-0525-4f20-9d98-f4e30a79c130/youtube_to_avi_free.pdfIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_8a749c700c5a452aa16d1dc652818a35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/cyberflix_for_android_box.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/why_wont_my_fitbit_charger_work.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_off0001e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E447 5384 bytes
SHA-256: 33eb0b4f7126f6e1cf86e97f25eb99beb463d6e0d246e22d671fed6352f45249
font_01_sfnt_off0001f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6B6 11308 bytes
SHA-256: 7e6a3c2447242e1494ae2b41ec92d1a3159adbdeb26bae99703cadd93dea5771