Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5674d2500cf3ea2…

MALICIOUS

PDF

80.6 KB Created: 2021-06-04 02:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e49676a69ba248d82dc22aeaf5fabb8 SHA-1: 5654df6d4a124761f1424643a200f20fb7beec54 SHA-256: f5674d2500cf3ea242127c7dc78e57978e08e68327f87efd2bfd0e7d68d7fed5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary URL observed is https://crysiq.ru/pbw?utm_term=what+are+some+good+listening+skills.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/pbw?utm_term=what+are+some+good+listening+skills PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388158/normal_5fe2d8ee86e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_604f563eece6e.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/suriwarologexim_wekonokajejif_vefixejuzevefe_bopinaronow.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/jetag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_6066f489676d1.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/papotofuwa.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/nadifusik.pdfIn PDF document text
    • https://puvedevedumu.weebly.com/uploads/1/3/1/4/131406841/5479719563.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/572e7a.pdfIn PDF document text
    • https://nusesosof.weebly.com/uploads/1/3/5/2/135296084/82ca1.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/8c06dac2f.pdfIn PDF document text
    • https://mujatasibofemi.weebly.com/uploads/1/3/5/9/135963028/8930257.pdfIn PDF document text
    • https://xulobefopit.weebly.com/uploads/1/3/4/3/134349373/e72d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fdb632e4e784.pdfIn PDF document text
    • https://zosubidam.weebly.com/uploads/1/3/4/3/134316114/88508370393c9.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/senavuvuniwex-jiketinumijoles-mobikezik-mapodupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_6065179ff0ba2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425631/is_a_crystalline_carbon_allotrope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171917b4-b641-4092-8942-8dc480f422f8/popubokobimipiwo.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144579879/43048262278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d876b8-9ceb-4692-b448-498f4e9039d7/jemogovetiribinimewibaj.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/f/second_grade_grade_2_reading_comprehension_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bce8d4-6092-4901-9d27-5fc77f466316/vijowuzeniloxosixapeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b42a77a-b2cb-406f-bfd6-43431d8821c4/own_free_will_define.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5104 bytes
SHA-256: adb8e0d58c86580849582471a8a91bd4e1c7353aa6e3e09839b2cceafebd391b
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10400 bytes
SHA-256: 05335e267218a310584f9f18b8d997ec42d577dbfa784041c43315b584b20f68
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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