Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b720a73eb144d5d…

MALICIOUS

PDF

73.9 KB Created: 2020-11-19 12:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 76e2dc12080bd71c2d4d58e7aa64aa8c SHA-1: d96b625c476118778519b04c4a0b2cd767cdd62e SHA-256: 4b720a73eb144d5df01b0c377033343ee075bffb9e3652d7319f27444b37b338
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://traffnew.ru/123?utm_term=landlord+mod+apk+android+1 PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5f9f9a22d8696.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/c62ab695cfd.pdfIn PDF document text
    • https://rarowovi.weebly.com/uploads/1/3/4/6/134664267/zilinafonewebesakodu.pdfIn PDF document text
    • https://vegirizixe.weebly.com/uploads/1/3/4/7/134716682/mazugatapatax.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/nigivaxaxudazif.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/vexilaxowiro.pdfIn PDF document text
    • https://vumerumub.weebly.com/uploads/1/3/4/6/134634189/davubu_likavovupedaja_dagukezikilem_wamogaw.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/853282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5fa94d1e1eba1.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/123c8.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/kamojivusalasafe.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/4b666803-91df-4f65-9dbe-29c3fcc3e3b4/men_at_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931cf350-5ebe-49d6-9125-b06dcc43b4fb/tipusufazadovuzifepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96865bf-572b-4039-984f-361039fe4a4b/les_arbres_et_leurs_symboles.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 4984 bytes
SHA-256: a359efa9aaf49c780d9a2e35613d9baed548d265570e43757d8591f617e6eb02
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 11052 bytes
SHA-256: cfad8aa108def4407f58f0b8ebd1c62f3ad411adf9c49b913962fd0fcc954d47
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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