Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd7fd615e313b80…

MALICIOUS

PDF

86.5 KB Created: 2021-03-17 17:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1f080cf4d2dcd90c9ed0eb6e2d5eb3f SHA-1: 548aa194aa6ad9145f263596473a0fdb999a3e7b SHA-256: 9cd7fd615e313b80fcb5b75267b305f9d04b55b2e8802abadd7cb4995f7d6c6f
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://dugedepap.ru/123?utm_term=casey+stoner+pushing+the+limits+pdf PDF link annotation
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/vazotorozipotunemevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_600cd00a38502.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/7e464.pdfIn PDF document text
    • https://sozulidalipidin.weebly.com/uploads/1/3/1/4/131437061/dejamovogimune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_602f523135f72.pdfIn PDF document text
    • http://revujutipisan.22web.org/mojinuvivij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_6013b46da1611.pdfIn PDF document text
    • https://pafajarofotixo.weebly.com/uploads/1/3/4/7/134773208/bejefiwuw_nawodixe.pdfIn PDF document text
    • https://guxafosiwu.weebly.com/uploads/1/3/1/4/131453681/negomi_lomedizejujeme_xoluj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_17a753cd92c54ace838e85af9c7b0585.pdf?index=trueIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_d3dda83c7e064d188db1f8b78af69e06.pdf?index=trueIn PDF document text
    • http://jexoxitisujoj.rf.gd/toshiba_32c120u_remote_app.pdfIn PDF document text
    • https://530ecf7f-ee31-4098-b79c-2a505460d383.filesusr.com/ugd/3e0cb9_f32ccb7da0f747b1bbd2835fd04415cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/14288619232.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/rainbow_tables_windows_7.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_0f2a94f2476e4210a447c2ae268b5f1e.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_45bc2ecf01a64499ac3655fcedcbe3e0.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_005e359b89464094b847782d0811fbf1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/pijuwowamevosakoz.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d41d3914d5934675b8d8fe299468f34d.pdf?index=trueIn 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_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 5464 bytes
SHA-256: 4ae514c79dfcc6f42997af69b3dd595d60b1cf37ff04387d41e16161c0be0158
font_01_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 11028 bytes
SHA-256: 6744d8136d62ea07b1ca596cf23b16221bdcf0d83a414418919b7b5da2b558ec

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