Malicious PDF — malware analysis report

Static analysis result for SHA-256 4375d87f9e9d14d0…

MALICIOUS

PDF

75.6 KB Created: 2021-03-11 15:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ecba92511dcd1add1247e0107a2c62e SHA-1: 47c0784a0404a1e7ed8d61eea4f8b351dbab1977 SHA-256: 4375d87f9e9d14d0270adc7449a03995dfa08cbf7eed2ea89fe308146ffecea5
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious or disposable hosting. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. The presence of numerous external links suggests an attempt to lure users to external sites, a common tactic in phishing campaigns or for distributing further malware. No scripts were extracted, but the structure and link farm indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=is+too+big+to+fail+on+netflix In PDF document text
    • http://icub.tech/finaroxolp4sv0.pdfIn PDF document text
    • http://goodsfor.life/jupomenejabixorixasesufbcz40.pdfIn PDF document text
    • http://lesantyqas.online/inspired_education_inc_answers705sh.pdfIn PDF document text
    • http://funseeds.site/how_to_connect_a_rock_band_guitar_to_ps30bxde.pdfIn PDF document text
    • http://randname.ru/weight_lifting_routine_for_beginners_at_home09pn3.pdfIn PDF document text
    • http://uber-global.com/arabic_keyboard_for_android_2._3._4y0ls9.pdfIn PDF document text
    • http://tgesheff.xyz/29644209983vbgj3.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/3b68d680-addb-49a9-be0f-d6ea3200f9cb/volvo_penta_sx-m_outdrive_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/khund_by_bai_brar_new_song.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_06c54a622a904e1cb409165e9521457e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/391714b0-9160-405c-8b45-00e7f83ba579/guzazes.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/52116490399.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_fb6ce7d68de14d23a48433bba41098c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/25968218583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42a9175-34d7-4786-b710-4d125b41d037/what_is_single_use_plastic_bag.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/scorched_earth_full_movie_free.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_2aa0260b066540239d38e596aaf74263.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8e75a3-895f-4a7c-9ea8-db4d00a963f4/wahl_trimmer_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e2412d-b125-4353-b918-d9632bd6c470/xodowisetoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9155d585-a9f2-4076-ae2a-91f968176c21/how_to_get_unlimited_money_in_farming_simulator_19_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/68949003554.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_86bc9d319cb4447d8bdbe1c40d47e238.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 4984 bytes
SHA-256: f8be06e4e4630eadd06e6b73aed74f0781fdd80474b91bd78a000c687b09343f
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10784 bytes
SHA-256: 8a9302f5321934f3ad42df9867540915f9967a0b45e77ba3e499c12b8a8c9d9c

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