Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a2e68d5607b614…

MALICIOUS

PDF

80.5 KB Created: 2021-05-07 12:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3b59570ede3357aeb1029414998180f5 SHA-1: 8cf95262ea80dbae744217a7f0cec20ab2523751 SHA-256: f9a2e68d5607b6143bb27562e91e8b80f7c274dc08afdf9b2518f7bf6bc239a8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a large number of links on potentially untrusted hosting, reinforcing the phishing or malware distribution intent.

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://bologen.ru/strik?utm_term=cycleops+fluid2+bike+trainer+manual PDF link annotation
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/6457107.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/56551574834.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/nonaxewugisar_fabixebor_vokogovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5ff5f64080069.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/a9faae98e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fe2840e66c3e.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/hemolytic_uremic_syndrome_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fe6a35eeb97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fedab80a7d7b.pdfIn PDF document text
    • https://wadasowodasi.weebly.com/uploads/1/3/5/3/135316150/guguteniloko.pdfIn PDF document text
    • http://mexevuk.iblogger.org/linear_algebra_symbols.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/totaline_thermostat_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visunes.myartsonline.com/il_est_ou_c_est.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c127a31-d4a3-478e-a03c-7f6f949390c4/86965160014.pdfIn PDF document text
    • http://datidalumoz.rf.gd/84699219937.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/pidosor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b44b3be-4196-4436-9cc3-66cfc4b18fc1/zilarunemepomivugeguduva.pdfIn PDF document text
    • http://kofujuluzode.epizy.com/paxusenezipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cdd6fd-9156-476d-9828-c6a9e89eac44/kyocera_fs-1135mfp_default_username_and_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14089880-bb0f-4992-8ae6-65ca88eb4167/76294183220.pdfIn PDF document text
    • http://bupalim.atwebpages.com/dictionary_of_psychology.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_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 5644 bytes
SHA-256: 506df6377a1b83e10fd9a8a95ec874e6803527c31f447bd930dfef61c34d5ce5
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 12492 bytes
SHA-256: 6adc3e8eb856fa81af856351bd8283954a3a949ea8f685bc6648de7b17d9a555

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