Malicious PDF — malware analysis report

Static analysis result for SHA-256 973341c4f997a832…

MALICIOUS

PDF

73.5 KB Created: 2021-02-11 13:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4530bcbf97a1750878779fa3bfa82d67 SHA-1: e51680c112c75059ed331f589711767f907da0b8 SHA-256: 973341c4f997a832bf9f1bc7fe8ee3e7f4f2f6f75983f55cc5be81ea472a493f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, with a prominent one being 'https://leonvi.ru/aws?utm_term=nc+health+assessment+form+spanish', suggesting a phishing or redirection attempt. The presence of multiple links on disposable hosting and the use of UTM parameters further support the classification as a link farm designed to obfuscate the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=nc+health+assessment+form+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382189/normal_600c46135e068.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/hdidign/migenobomarul.pdfIn PDF document text
    • http://notozil.iblogger.org/canberra_institute_of_technology_international_application_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481422/normal_5ff07bb43fe37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5fc6910581666.pdfIn PDF document text
    • http://futegejetebe.22web.org/80712509628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_6004a88699e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fff93c0ebbd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fe4ba555f453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojutudur.epizy.com/14887530.pdfIn PDF document text
    • http://pigibotokaper.epizy.com/skeletal_muscle_activity_worksheet.pdfIn PDF document text
    • http://dafudezukixoz.epizy.com/gidijojive.pdfIn PDF document text
    • http://joxumokuri.epizy.com/ignou_december_2017_tentative_date_sheet.pdfIn PDF document text
    • http://wevopik.rf.gd/lavuzikidenaxaluvev.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/15505188826.pdfIn PDF document text
    • http://motinekan.epizy.com/modern_probability_theory_b_r_bhat.pdfIn PDF document text
    • http://vowefaxi.epizy.com/beavers_bend_fly_fishing_guide_service.pdfIn PDF document text
    • http://babotos.epizy.com/verbal_reasoning_test_practice_questions_and_answers.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_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 5224 bytes
SHA-256: d691ffa8ddd409742dba58d15c7672414e353b51fc93344685dd932f772a14bf
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10900 bytes
SHA-256: d5f93e100d471e0cffa266b05dad979ca31a65fc0979b0f191725a2725128cc3

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