Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6e651f600cc385…

MALICIOUS

PDF

89.7 KB Created: 2021-03-18 18:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ec604376d447af78cc693124c775575 SHA-1: 6143c80b19ef9856ed3ca21ebc2d8f26e02cd7b9 SHA-256: 1b6e651f600cc385babba4c912d853d42b947c746026c8d627dc64d418c88f9b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=new+tax+rules+for+rental+property+uk PDF link annotation
    • https://zegemukugemilut.weebly.com/uploads/1/3/4/7/134707242/9807733.pdfIn PDF document text
    • https://zogewuvenofo.weebly.com/uploads/1/3/2/6/132683334/9762940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_60443f22e640b.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/690accf2c5c0220.pdfIn PDF document text
    • http://vemasujananexu.22web.org/fda_ind_safety_reporting_final_rule.pdfIn PDF document text
    • http://xowimixipivup.22web.org/english_quotes_about_life.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5ffea3914a51b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_604d00d702dba.pdfIn PDF document text
    • http://car-test.pro/classroom_management_books_for_teacherswao8e.pdfIn PDF document text
    • http://knitfqph.site/xojenusuforakanilof71grm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fd61b2e777bc.pdfIn PDF document text
    • http://kugamuwefula.iblogger.org/koxitekeraludamogo.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/kidowaresilaziloz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_6041873084bc7.pdfIn PDF document text
    • http://rubeatyshop.xyz/6687939479855vul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pubilovojut.epizy.com/5445972539.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_c5658e6c92f54b709e0a439c522bc274.pdf?index=trueIn PDF document text
    • http://gumofiwulova.epizy.com/wejajulapu.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_44a26f1e47924785b2a50aa05b9cc2d5.pdf?index=trueIn PDF document text
    • http://nixutemexeteted.rf.gd/cg_cabinet_minister_list_2020.pdfIn PDF document text
    • http://jabepujun.epizy.com/dewipozujujuvil.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_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 5192 bytes
SHA-256: 84bc1b8ad479edcdd8b11b56f1e920b966b11287dd3a0eca461bcc4226f772f2
font_01_sfnt_off000133db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 11052 bytes
SHA-256: bf00780a6194f756389fc49c42c2ae3038e14e1a80074be1e64f3c42abf85454

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