Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed35240689bfc41…

MALICIOUS

PDF

77.1 KB Created: 2021-05-29 12:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 869b3a4aac1f594ed78cf4f3563c8782 SHA-1: 564936880ce91628fd6bff322ff455adfefb9de5 SHA-256: 7ed35240689bfc41b8703aa24976cffce9ef345147e70c7c57d3551af13d7ef9
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 0.9996

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://maypoin.ru/123?utm_term=atresia+yeyuno+ileal+pdf PDF link annotation
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/mulogimon-vibubedimef.pdfIn PDF document text
    • https://maxafusisiwesu.weebly.com/uploads/1/3/4/6/134688878/910877.pdfIn PDF document text
    • https://rujajibagakolu.weebly.com/uploads/1/3/5/3/135303982/fazamure.pdfIn PDF document text
    • https://kixoligo.weebly.com/uploads/1/3/4/6/134608980/887329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_6068257a26f0e.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/7094798.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/5153942.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/juwog.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/wikoroxo.pdfIn PDF document text
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/56f87a5034a8a.pdfIn PDF document text
    • https://vejesare.weebly.com/uploads/1/3/4/4/134493146/jupota.pdfIn PDF document text
    • https://tobopitoru.weebly.com/uploads/1/3/4/8/134872655/5898991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465142/normal_60089f941dd4d.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/5776480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_60232f1902387.pdfIn PDF document text
    • https://xixodojele.weebly.com/uploads/1/3/4/3/134375941/jozalotuvo-puvakatezo-watewer-tuvido.pdfIn PDF document text
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/6a7c472d46.pdfIn PDF document text
    • https://felevigapoboxoj.weebly.com/uploads/1/3/5/2/135299972/rinuzexufu.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/josotalozufima.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/75656b3b-e2e4-4efe-95ea-b69d00b8dec1/40023256176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c9e8ef-e539-4f4f-88d4-23d9aa22d38d/nedoroluretofatujobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776bf1fa-2e68-4939-8026-7e065d38c2aa/jawuguloxejumajaboxoko.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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5128 bytes
SHA-256: 24889228d1e51cf436c896c94c235e1a98d8807233015071e08a5a1a0b1a9de4
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 10776 bytes
SHA-256: 972d84bcce9fbf392e76d2d9aab6e987ae5f0f2a8991a51729c2f425654350dd

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