Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a89c5b1de99197…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 14:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3210ee67cd72ae95f5368544773383a8 SHA-1: 15bd283b8d87f1ea1193e51b3d86dc815a92cf9d SHA-256: d0a89c5b1de991978184a779f1a776c90f1bf3eea5cd5640b94ed9feab45fbb8
126 Risk Score

Malware Insights

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

The sample is a PDF file 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 content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on disposable hosting, likely to obscure the final malicious destination or to evade detection. The document body, though heavily obfuscated, contains text related to 'test de matrices progresivas de raven para adultos pdf', which appears to be a lure to disguise the malicious intent.

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://nipisod.ru/award?keyword=test+de+matrices+progresivas+de+raven+para+adultos+pdf PDF link annotation
    • https://cdn.sqhk.co/bidekidarub/bDhahe9/natural_oval_shaped_acrylic_nails.pdfIn PDF document text
    • http://lidedapomegila.iblogger.org/83754723427.pdfIn PDF document text
    • http://ostanni.fun/kuvif9khkc.pdfIn PDF document text
    • http://gimerixifaxet.iblogger.org/rifuvanaselilovoxonuga.pdfIn PDF document text
    • http://stickerrus.ru/kekufx95za.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/aditivo_diesel_performance_peugeot.pdfIn PDF document text
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/2fb9f.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/bawuvuxoru-tuwenumuwunome-lijisabonefob.pdfIn PDF document text
    • http://all-casino.xyz/tibesenars1lfh.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/hjcjajf/eve_portal_app.pdfIn PDF document text
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/5446057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizifar.epizy.com/papozifejuwu.pdfIn PDF document text
    • http://zubikexef.rf.gd/fajazakasisojagovotezeto.pdfIn PDF document text
    • http://ginokaze.epizy.com/estimate_template_word_free.pdfIn PDF document text
    • http://gigigij.rf.gd/99668560580.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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 5484 bytes
SHA-256: 9dced207fa8e53b1aaea0f09024cad6cc0aad0759663f5bc4824b11c8496ebcb
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 11016 bytes
SHA-256: cd0aa956e74a2500592a990cb14145341067d9c1c659935d0cd37fc3a42e16f1

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