Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ae3abb264328eb…

MALICIOUS

PDF

68.6 KB Created: 2021-02-20 14:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8842bdc482687bca9f4042f745e07acb SHA-1: 737ea4341e155a740ae56995d15065c5c4ea2fd8 SHA-256: c3ae3abb264328eb4c223658a82d2bceaaa40e5e3c6c054cb6cbcb8b5494bb47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with at least one, 'https://druttle.ru/123?utm_term=realtor+code+of+ethics+article+13', being a primary indicator of compromise. The PDF structure and embedded links suggest a phishing or link-farming attack pattern, likely intended to redirect users to malicious 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/123?utm_term=realtor+code+of+ethics+article+13 PDF link annotation
    • http://xuzejomuxide.22web.org/rokiximirosori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_5ffb11e99b0d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_6010320bd54cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_60188c073f91e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fe148222f5d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fd2e63536ba8.pdfIn PDF document text
    • http://prizinsta.info/aluminio_propiedades_fisicas_y_quimicasdqhre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fd0d9ae7331e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5ffa926fa7640.pdfIn PDF document text
    • http://reduslim-europa.site/gagivofitegokonoxituqdtc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvedizokonidu.epizy.com/62625633048.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/search_piano_sheet_music_fortnite.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/chipettes_happy_birthday_video.pdfIn PDF document text
    • http://levowemorunob.epizy.com/48085959579.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/barden_bellas_last_performance.pdfIn PDF document text
    • http://pobediwawe.epizy.com/71532952905.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/que_es_analisis_de_composicion_corporal.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_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 5332 bytes
SHA-256: 6162d0a744df70bb76833948cc6ae14ea20200a9efc66d50a391317e5a9c8b4b
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 10336 bytes
SHA-256: ba15d3592e10f0a5184624369f4ece95542300473bb49eaf883c1f293e66e41f

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