Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09b553316ffab85…

MALICIOUS

PDF

88.1 KB Created: 2021-04-11 00:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0b52a3ef714442d614d4f4c1413a5de1 SHA-1: 7945b6ebf065b887b77f6722d807b49d906e0a91 SHA-256: e09b553316ffab857fe04b3c785ec0cf478a09e7d381171ea846fb046c7d018e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The document body, though heavily corrupted, contains a reference to an 'Acer nitro 5 15.6 gaming laptop review', which is likely a lure to encourage users to click on the malicious links.

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://dugedepap.ru/strik?utm_term=acer+nitro+5+15.6+gaming+laptop+review PDF link annotation
    • http://steelsho1.club/53435819223rpovb.pdfIn PDF document text
    • https://cdn.sqhk.co/vipatajase/mjfjdgg/international_business_times_the_tesla_killer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_60552ec952b21.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/sirodijezezer_tuwaxibudesuv_nezazajoxore_bomopi.pdfIn PDF document text
    • http://brosbass.com/80474546007hbjgi.pdfIn PDF document text
    • http://legendbilisim.com/473998931333iac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fdcf902c9bcd.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/e4b75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5fc6b4b96569f.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/JjdhcUx/classic_car_driving_racing_simulator_mod_apk.pdfIn PDF document text
    • http://tumbochka.space/fuzuli_ikayetnamebncqa.pdfIn PDF document text
    • http://pe50off.info/182567872966qryt.pdfIn PDF document text
    • https://vunorozixu.weebly.com/uploads/1/3/1/1/131163876/4069425.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/dapawuve1skp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_6065ff078a02a.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/jKjin6k/vudekomofizusogukaveju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5ff9b8dbb3cb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_130dd968f62c4aa1b984a144c65d9621.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_6d5c3dd645554d63bad765dfe60c3f10.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_d02824eb5a504d6c9c3ed89444703c4a.pdf?index=trueIn 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_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 5576 bytes
SHA-256: 5d92a37ea543c37cebbbc1dd8558ca8e284bcb76735804df6769ceb34a532820
font_01_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 11316 bytes
SHA-256: 07fb24968a5544d6eb3d4fdd5588f1a132f317b605d3adb97e380477e946c06f

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