Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd02e5ef3bdd87e…

MALICIOUS

PDF

74.2 KB Created: 2021-01-18 18:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9f8e6df872c0288cf31ac2885b4cd0ee SHA-1: 21e5491fb7402d62612d19f5add5d183dec0cd85 SHA-256: bdd02e5ef3bdd87eb39160fea49c4e57c6c34bcb680837684851950ded9729d6
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The embedded URLs, such as https://baarspo.ru/123?utm_term=clicker+heroes+mercenary+guide, are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

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 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://baarspo.ru/123?utm_term=clicker+heroes+mercenary+guide PDF link annotation
    • https://site-1178214.mozfiles.com/files/1178214/horn_blow_2_song_pagalworld.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/4884710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5f9442484de6d.pdfIn PDF document text
    • https://site-1220223.mozfiles.com/files/1220223/83043616205.pdfIn PDF document text
    • https://site-1180999.mozfiles.com/files/1180999/97807168715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fae2e51f02bd.pdfIn PDF document text
    • https://kajukuka.weebly.com/uploads/1/3/4/3/134307777/koribeguw.pdfIn PDF document text
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/ff501282ed.pdfIn PDF document text
    • https://site-1174582.mozfiles.com/files/1174582/37450219503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fe85c1ad98ee.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/daxatipafo-xoribuxu-duwagopegodot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5fe482ae4b15c.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/vudonolinubusalop.pdfIn PDF document text
    • https://genolawibiwiz.weebly.com/uploads/1/3/4/3/134316454/3095498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ff1d58abcc85.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/fasanag/mamogekupigoxok.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/doxefe.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/zaporimil.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 5424 bytes
SHA-256: 63d93ed28e0326ab8847e05cbdf13c7879b149b84d109394d4c48120d9c25d9d
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 10752 bytes
SHA-256: 9b83c4cfe8f0aec9cb6765d50ad54de749e8ff4aea353e18516c4d4b865d787f

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