Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a70faedf3c0d46…

MALICIOUS

PDF

71.3 KB Created: 2020-11-26 03:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 673ff3dd4c70c52dc68e180bc57cb6cf SHA-1: 6ddb4035d48ee8ae6795e80fe4f1c3b7560808bf SHA-256: 63a70faedf3c0d46f24f0b24f57b652170b230048380a2c8885a4f9189de86cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, but the presence of external links and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users.

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://trafffi.ru/strik?utm_term=shark+navigator+deluxe+manual PDF link annotation
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/butalusagu.pdfIn PDF document text
    • https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/9143924.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/panutavulibopof.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/844389.pdfIn PDF document text
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/323bdcbf08b.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/6f5be3a943e.pdfIn PDF document text
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/tofezeti-ragujemu-wejopeweje-suvobupov.pdfIn PDF document text
    • https://tigafuxofezez.weebly.com/uploads/1/3/4/3/134363272/2ebbf0ffd640.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/dukexajuj/68038112394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e4e3a5-6d9f-431e-9569-0fe2412e1861/27299142597.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/97094808444.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/jitemotifevaxiluxubaveku.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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 5356 bytes
SHA-256: 0706b1983c56dc48a87a339ab01175dcf49dd365b0eebb246137325be40323ba
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10972 bytes
SHA-256: 5a350535212784a5b0dec0fa78787f05809a7812507033c58dedfb93b33f8db1

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