Malicious PDF — malware analysis report

Static analysis result for SHA-256 627afc615ac29df7…

MALICIOUS

PDF

143.4 KB Created: 2020-11-24 03:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f3cf2792918910b2c651b3d2b7cbd2ce SHA-1: 279eb969a1caa330eee5b6b78c113f79f6518e65 SHA-256: 627afc615ac29df7789ba78b8021e0f32a48d63aef93fd4613819d7e43c8b7aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=iso+31000+pdf+bahasa+indonesia PDF link annotation
    • https://nomumiti.weebly.com/uploads/1/3/4/3/134330837/fakeziwovepetavuz.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/fozijuwivaliju.pdfIn PDF document text
    • https://kewusubeve.weebly.com/uploads/1/3/4/5/134515363/a0cd61b01c8f419.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/4235858.pdfIn PDF document text
    • https://netaxodesu.weebly.com/uploads/1/3/4/3/134367037/pogog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460071/normal_5fa98ef46be05.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/7179233.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/pijatup.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/96cbef3bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fa337a955793.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/wixugowitenawirijoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sigobija/azimut_holding_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3951e5d3-cdb5-45f0-aee3-be4144547f15/mavic_pro_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5563934-70d9-47e6-8e48-4addd8a21aee/52726072808.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_off0001f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F55F 5436 bytes
SHA-256: 12a82661f203b6538c2071cb229764923f92f7f51c25047c3ae76533e212e4ca
font_01_sfnt_off000207d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207D8 13136 bytes
SHA-256: e96b40bfcb9d63681915b7a5e8de1497740dbc217d0734f92ea66802e8a4e3ea

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