Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6528d0187f1b7e…

MALICIOUS

PDF

86.7 KB Created: 2021-04-06 07:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9a470aaed1f414ba5c5cc5a43c53e93f SHA-1: 71f47e5058d58d1b70f19e30dd043617c20994db SHA-256: 5f6528d0187f1b7ebd51e0e60ca2334f65fa9c4052f75e264d0d4e8f8ecc1dd7
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://botokaw.ru/wix?keyword=oceanography+merit+badge+requirements PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391001/normal_605baf47085e0.pdfIn PDF document text
    • http://wadumutid.iblogger.org/gevigoxifovexibuwapedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420617/normal_5fdd8fdd3e050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465274/normal_6011c287a7ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_602a8a919063c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_601f25955a59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_604181336fd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_6055bb6ac0e75.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/4418243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ff282aca0ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_604e992287f66.pdfIn PDF document text
    • https://nibasekugi.weebly.com/uploads/1/3/1/0/131070633/kirogofesudavo.pdfIn PDF document text
    • http://kulapub.22web.org/nafajuzaj.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://xonelamurojili.rf.gd/mexoge.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/center_tapped_transformer_rectifier.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/depaviw.pdfIn PDF document text
    • http://kofukobekageja.epizy.com/xuxakodojipurekumaxore.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/sixuzenobog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a97ed1-24e3-4a3d-9cee-6caae2aa0b9b/how_to_delete_bluetooth_device_from_jvc_kw-r910bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f600d68b-adfb-41e7-a274-f80ef9f86fc9/44966363771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a48cfa-6bf5-4582-b64f-97d08e7357b3/devogez.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_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 5732 bytes
SHA-256: 80e2800f1be6f82cef5aa856592c9bddd74a0aa4fe30d0fbcfd3e2ef52187e70
font_01_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10844 bytes
SHA-256: c9ddafdd094ad6c1177b5acde6a12da3ad0c8162a3eea22a4a0472dc44a64e1e
font_02_sfnt_off00013f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F28 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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