Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b557dd43dbd627a…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 04:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 556b5129d7ebb21d368a1097a124d703 SHA-1: 2b3833b48f53908c7cf00da614711486bc791ced SHA-256: 8b557dd43dbd627ab735a3defb46632c6abad1c5577a8650affcfa448ca51463
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as link farms, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the overall structure and URL patterns point towards a malicious PDF designed to redirect users to harmful sites.

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://druttle.ru/strik?utm_term=making+content+comprehensible+for+elementary+english+learners+the+siop+model+%25283rd+ed.%2529 PDF link annotation
    • http://trenolgia.buzz/baby_shower_bingo_templateh7qn6.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/85215702531.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/mine_clicker_mod_apkobcg6.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/can_i_convert_to_jpg_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/hdFjeTZ/door_kickers_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/GUdAie1/10184732988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424026/normal_5ff25412ae8e9.pdfIn PDF document text
    • http://zuvels.xyz/19844256048an5s1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_600cec8dc47ea.pdfIn PDF document text
    • https://cdn.sqhk.co/vujuzira/hbihiuJ/47645453677.pdfIn PDF document text
    • http://otshelnik.net/hierarchy_chart_template_freegbmu0.pdfIn PDF document text
    • http://topplafond.xyz/donizanuwtorp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_6014db3529983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudepenota.epizy.com/new_christmas_movies_2019_on_freeform.pdfIn PDF document text
    • http://muloluj.rf.gd/11035533056.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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 6232 bytes
SHA-256: c5000f65f2c76c1c536d5d307bbb936efca86c38be828c1f01ff47f67a064b8d
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10884 bytes
SHA-256: e4489685a60c9f713dc32bd8b4cc7a0df80923d86a884d782fc0d1efb6e99578

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