Malicious PDF — malware analysis report

Static analysis result for SHA-256 8455e839ed312c33…

MALICIOUS

PDF

63.9 KB Created: 2020-11-24 01:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d62a4fba9c79aec40eaa44d01bfc8007 SHA-1: 2c11972a15f3a49b57f69478bb06003733d6b29e SHA-256: 8455e839ed312c33002a3f5b82f77170f3a5f9682711a34c77405b997a4f063c
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://trafffe.ru/strik?utm_term=lattice+energy+of+k2o PDF link annotation
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/latozovubivozidibe.pdfIn PDF document text
    • https://delezopo.weebly.com/uploads/1/3/4/6/134600584/fojumenifi-wakewajedonewop-begenid.pdfIn PDF document text
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/metazavusupajemu.pdfIn PDF document text
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/7804110.pdfIn PDF document text
    • https://jobipidamefoji.weebly.com/uploads/1/3/4/6/134696246/wowat-newejeva.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/3222444bf.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/01f51efd305e1.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/617c8792-6c8d-40bc-bf8a-a57e41547afa/66828188998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4b58b2-a261-4f01-9487-4258c0b8ed61/69328619696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34dab35-9d06-4aec-a1f4-b7f9707438b1/gekasapulimizin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f05d157-cdcd-4c99-bbbe-f480926a120e/kedodutumunij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b617eb06-33c4-4718-bd4d-cd331b4381b5/7711233111.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/printable_estate_sale_contracts.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/88301550210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7bfec5-c0c1-498e-ba73-adf82e52f111/ruzuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edd3c32-ab25-459c-acec-9d73c0c3ac5d/30065261678.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90C 5080 bytes
SHA-256: dc2bc6e78e27caff235c1aa92fe8a7ba448f3229cf975f11d3a9d2612adccdb7
font_01_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 11868 bytes
SHA-256: 8b71f5364e90cd093d16fd13da174a6ed8140cb92afbde8a5edb666ba389bcdf

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