Malicious PDF — malware analysis report

Static analysis result for SHA-256 61db44de8baf6bf1…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 18:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bd691566c64ddb3eca32a0bbb6123c9c SHA-1: f5f6a94254ed8f03e1df41951a34da78e875c753 SHA-256: 61db44de8baf6bf1c53a89ba52f1f1158eb4ff02d279a7739ad9afaa18487d70
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains and Weebly-hosted PDFs, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites, potentially for credential harvesting or further payload 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://leonvi.ru/wix?keyword=ffv+class+guide PDF link annotation
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/1861745.pdfIn PDF document text
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/sarobeketema.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/b894a6c149.pdfIn PDF document text
    • http://reweder.site/zaripozep1jn4g.pdfIn PDF document text
    • https://damabinon.weebly.com/uploads/1/3/0/7/130738970/6285805.pdfIn PDF document text
    • http://teplotronic.ru/vokizagujisaganirugotjbpz.pdfIn PDF document text
    • http://rijafinawaxus.iblogger.org/6124215635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fec1409ee0cf.pdfIn PDF document text
    • https://sadejakudabad.weebly.com/uploads/1/3/5/9/135965210/8986928.pdfIn PDF document text
    • http://ranking-se.com/61818970845n910f.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/fuvexezomu-xariwutuzadoweb.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/2029c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6013b9109ffa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_6018e9d899f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_6021fdf9728b5.pdfIn PDF document text
    • https://jizuxiragoleti.weebly.com/uploads/1/3/4/6/134639642/4869964.pdfIn PDF document text
    • http://home.eyesonff.com/content.pIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/pofup.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/apparatus_film_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/logo_quiz_level_2_all_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/wupotafa.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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 5108 bytes
SHA-256: 320dc030718ec64b39945284f809ac2f6726c66319a90e2b7e356943262086a3
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10592 bytes
SHA-256: 8ffc885740f3412482aba4043dc0c783c5630b9a9ef105fca552a801be29a07a

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