Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90fca6855c5c783…

MALICIOUS

PDF

72.4 KB Created: 2021-05-30 04:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 24707692504a558671397622db632a57 SHA-1: 23eea6c31243e8071bb38f6a60dfe8729446249d SHA-256: c90fca6855c5c7831753a15186bdc2b806b9acd8bdc05d5dea1dd01b43eb0df9
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 0.9998

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://pelibifir.ru/123?utm_term=animated+gif+wallpaper PDF link annotation
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/zifofup_nokuvij_nowebujeledasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5ff9ffe61b3e2.pdfIn PDF document text
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/maxojenefe.pdfIn PDF document text
    • https://repamepofasepa.weebly.com/uploads/1/3/1/4/131437198/0b7a4b9122be.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/liwolidexov.pdfIn PDF document text
    • https://falababipudin.weebly.com/uploads/1/3/4/8/134847750/d8fe996fd0405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5ff9e68189f89.pdfIn PDF document text
    • https://vupudirul.weebly.com/uploads/1/3/0/8/130874586/1cf58d9b.pdfIn PDF document text
    • https://vumamoxaku.weebly.com/uploads/1/3/1/3/131380777/jozisilizavab.pdfIn PDF document text
    • https://nuzewive.weebly.com/uploads/1/3/1/1/131164046/zadowel.pdfIn PDF document text
    • https://bakijunida.weebly.com/uploads/1/3/2/6/132695635/vidusufodadoso_xuvuzi.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/92f55cd.pdfIn PDF document text
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/wenetubefivapegadago.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/dc50167eb5b76d.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/jekojujug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_606aca206e2a9.pdfIn PDF document text
    • https://lebosipob.weebly.com/uploads/1/3/4/0/134040403/pujarapatisesilulupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d954c4f2-d81a-4f3c-b26e-533423a100f6/zageronipiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93045d72-9c62-46fa-9be8-6ab5bf65711a/pididomilababesokaligagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e04295e-c68e-495c-a171-1970decec71d/lelozunatidogopigatad.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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 5264 bytes
SHA-256: cf5cf6fe74d9d3751d2542888919801b4da814598f8298f8f4d2ef3fcbcdbeaf
font_01_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 10408 bytes
SHA-256: bbd92ed93fe7ccb534cc8e5dc8415d6ae91ca3f95e14d531db1e6c2e42ece044

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