Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ed584e9a879907…

MALICIOUS

PDF

73.2 KB Created: 2020-11-13 09:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5d277e51f167c95969521143ee13c931 SHA-1: d67bdbea2acf8a41f3d300a5eab02d25c8829412 SHA-256: 31ed584e9a87990725041111a1857c4921682d12a3277c87e71d31b138ec020d
156 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 5

  • 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.
  • 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://traffset.ru/strik?utm_term=determinantes+de+4x4 PDF link annotation
    • https://bofunakepubosux.weebly.com/uploads/1/3/4/3/134371141/jufegamarefavu-zoluxapame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f9c7e6de06a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5f978f9f912b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8f49c2b8bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f947c3bc1695.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/diwepubik-mifurekuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f8a5f1b39c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f989c61ad53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_5f94a43e4a243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/dream_a_little_dream_of_me_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df3e80a-f4d2-4e7d-999b-0cb5da2b59d7/why_do_people_join_gangs_for_protection.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/pathfinder_ranger_guide_archetype.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce17eb44-4558-435c-9daa-9f14f55ba8bf/tenitolop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a915ae5-0799-48f1-8aaf-9dcffb0149bc/40053196675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588f799d-f82b-40c4-854a-f43b88f6247a/me_divierto_y_aprendo_segundo_grado_de_primaria.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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 5092 bytes
SHA-256: 666813998907f275622545c2c428fafba8f617de92c09a3fd94afa1bb876460c
font_01_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 11292 bytes
SHA-256: b53c8d421326a3895d010b8384bf8a5945c076a35f01e0c65496edc58c52bb52
font_02_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 16212 bytes
SHA-256: bff84d5d1b37177a59207ada8eb7e853ef89062b5cfcb54104da675974eab4d3

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