Malicious PDF — malware analysis report

Static analysis result for SHA-256 b270a73aa87803d1…

MALICIOUS

PDF

62.1 KB Created: 2020-11-23 08:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4d4d498712663070dfaa4300f9b3a7f6 SHA-1: 9cff076bae631dea2d3980d342530b3e55e78b01 SHA-256: b270a73aa87803d137c7192d37a3e72d67a836d0e5f423196c30f7a622cf1830
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be a lure related to a song sheet, which is a common tactic for disguising malicious content. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=bare+necessities+ukulele+song+sheet PDF link annotation
    • https://fufirixosidewo.weebly.com/uploads/1/3/4/8/134868093/8872722.pdfIn PDF document text
    • https://xamiziniroba.weebly.com/uploads/1/3/4/6/134601490/vezovuruwan.pdfIn PDF document text
    • https://wuserugojikenek.weebly.com/uploads/1/3/4/5/134513610/zulupukiful-loxeku-vebedagazoxasav-putawetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_5faa1c593dd75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f8ebd437ec84.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8aa6afce3fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f8de69b1c9f9.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/nizemizejalisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f926565d301a.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/493762e0-cb81-42db-96e0-50f943b5a5de/65807405697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69cdcc6-c39b-4b01-888a-a9d6d9957e9b/fortnite_download_for_ios_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c4c9f9-3b6b-4f54-a920-a3df13e375e1/xofunuratigum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fc2447-9865-43af-8d84-43d88431dcb7/2952450512.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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 5176 bytes
SHA-256: bb2f23159d5507283cde40769fce00ae148df70a93a026c21357c9af732013f3
font_01_sfnt_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 10188 bytes
SHA-256: 9239cc7c99420a5e297e97cd2da61c9f334ece78cee48e963233797e765918f2

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