Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c227eb9143955da…

MALICIOUS

PDF

72.7 KB Created: 2021-03-22 03:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3b6a80d20f7c6c7fdb6ec7263a42088b SHA-1: 81b42f56ceca27aed95cb64a4ed46738c0e8e584 SHA-256: 7c227eb9143955da670a1e14e69aa88add34c105cd91c1fa514b6adcda154d7d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external websites, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit user trust by appearing as a legitimate document, potentially related to academic or technical content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=cardiopulmonary+bypass+and+mechanical+support+principles+and+practice+pdf PDF link annotation
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/167411b378306.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/6504344.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/fuwiw.pdfIn PDF document text
    • https://rodadeta.weebly.com/uploads/1/3/5/3/135391988/jiwizifolaxoden-sunovemabusowuv-binurijejavi.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/davufejukaz.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/kapazan_nasumawu_xafizafomimi.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/0a5dba6.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/megijonerexe_fafeliba_fedexizupew_mezux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_6025be60b9d70.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/2167968.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/93764688234.pdfIn PDF document text
    • https://fegoparowewara.weebly.com/uploads/1/3/4/3/134321013/masevu.pdfIn PDF document text
    • https://fitovixuzo.weebly.com/uploads/1/3/1/3/131380078/f4e78075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fca95e4753e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_8e9dc364fc264febb6270a30095500c0.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_6f236ad9746847d3a4ea92fbc47827c1.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_de53c03393754bd6b5856d1a92c50a68.pdf?index=trueIn PDF document text
    • http://zugepoguj.onlinewebshop.net/supufazusibitob.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/the_lightning_thief_movie_cast.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 5540 bytes
SHA-256: e98f51362efa1890a7b32600bd41b126a12516f7a6d7687787426024acd81a28
font_01_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 11132 bytes
SHA-256: 42068253ccf4b9115e03cc7a9f009f766457a96fe3ea901ca9d77d8d22dd091c

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