Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5d0177ff47fe9a…

MALICIOUS

PDF

74.4 KB Created: 2021-04-30 21:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 964bc3da2b743a7914702226bde2f3e0 SHA-1: ced55166d7a156b27945a8210b56d5b021f6b3ce SHA-256: 3c5d0177ff47fe9a257a413b171eab531a495d67d39eedc3f60919c3f61c4abc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document is classified as malicious due to its extensive use of embedded links, many of which point to disposable domains and redirectors. One critical heuristic identified links to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=dremel+flex+shaft+attachment+canada`. The document's structure suggests it functions as a link farm designed to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=dremel+flex+shaft+attachment+canada In PDF document text
    • http://figuxovutofid.mygamesonline.org/niv_life_application_study_bible_third_edition_leather.pdfIn PDF document text
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/e3e8dfa3a0dbb.pdfIn PDF document text
    • http://golden-charm.ru/94550869618b61xv.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/4170541365.pdfIn PDF document text
    • https://tudanane.weebly.com/uploads/1/3/4/5/134596872/2e5fe316e4f.pdfIn PDF document text
    • http://artdebug.site/ludaxenuwobepadulecun6q.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/6103947.pdfIn PDF document text
    • http://firstflirts.site/37962303135xwwyh.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/niren-zodapatixix.pdfIn PDF document text
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/lowaduxi-wonibetat.pdfIn PDF document text
    • https://movuwopolujot.weebly.com/uploads/1/3/4/2/134266044/mejizori.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/british_council_lesson_plan_template.pdfIn PDF document text
    • http://topshops.website/basic_german_vocabulary_bookytd0i.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/standard_enthalpy_change_of_combustion_meaningigg48.pdfIn PDF document text
    • http://doweryklkq.space/gefifajenabaaxufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipazafar.atwebpages.com/look_back_in_anger_in_bengali.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_475ad35d5b00420486f2c79dfd87bdc9.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_df4c3584d468431e91f8d91cdb87aadf.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_183c75e9eee54835a018438b559fce37.pdf?index=trueIn PDF document text
    • http://teluroluxeterez.myartsonline.com/54983970183.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_2da1edfdd9c948198f3156e7975b560b.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_576993c46bc04956bc1e070def3b7348.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5328 bytes
SHA-256: 82e75575ccf10f23c9dc5dc8c76aca79e828ef517b27df948724c8fe507725a9
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 11808 bytes
SHA-256: 42f0e8b66963ed4c5aaf1c2e1fefa5578bc72efcbde8b8941eb5eb27ac5e407b

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