Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5241c258946a8f…

MALICIOUS

PDF

73.1 KB Created: 2020-11-14 05:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 536cbd9f89f2693998e8969840670399 SHA-1: 94814f9430cf43212797590a63c105ed9ddd16b1 SHA-256: 3a5241c258946a8f96c0d5d76565d28b12c0b2da7515c1aaf82454bd031454f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs pointing to disposable domains, many of which are hosted on Weebly. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=how+to+make+flint+and+steel+in+skyblock PDF link annotation
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/dugik.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/128c663daad4be.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/1b16f65852.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/8701942.pdfIn PDF document text
    • https://tojopuxibo.weebly.com/uploads/1/3/4/2/134265943/laneg.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/4b78e02fcdea11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f9226c2f3575.pdfIn PDF document text
    • https://vekosakebasagi.weebly.com/uploads/1/3/4/7/134743747/8441179.pdfIn PDF document text
    • https://zemaxuwoti.weebly.com/uploads/1/3/4/6/134694437/3665126.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/wuniku/assessment_of_learning_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/bharathiar_university_mba_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/56132793307.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/fisojapimovu.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/sonic_the_hedgehog_episode_2_download_apk.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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5428 bytes
SHA-256: b7771d8436e173da7f0df45f3b3c3f192ae8f5395113191ff88d34b79ddb4179
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10960 bytes
SHA-256: 3bf2bcae635b1526672c2eaddde61e1d13b13b38cdb59a98c7f0d7b588006b24

Open this report in the interactive analyzer, or submit your own file for analysis.