Malicious PDF — malware analysis report

Static analysis result for SHA-256 397cd11a9d20d629…

MALICIOUS

PDF

79.6 KB Created: 2021-03-02 23:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0bb1c9ce273c3b89333b6dd26af491ba SHA-1: a7c18c0842412b2a05a1f037afdbf0f45b98b653 SHA-256: 397cd11a9d20d6290396c43c2916db2b7dbcc1f3ad4d11fd3e14a8c42e090cf2
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The document body, though partially corrupted, suggests a lure related to pairing a Comcast remote with a TV. The presence of numerous external URLs, many hosted on disposable domains, points towards a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the overall structure suggests it's designed 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://resalured.ru/strik?utm_term=how+to+pair+old+comcast+remote+with+tv PDF link annotation
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/kudawagetoxuver_sekezutope_febimibiso.pdfIn PDF document text
    • http://xojefaw.iblogger.org/general_psychology_final_exam_answers.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/58232325006.pdfIn PDF document text
    • http://streamsweets.com/78834748906mpie5.pdfIn PDF document text
    • http://show-visitor.xyz/78200422972lz2l6.pdfIn PDF document text
    • http://idealica-uficiale.website/xfinity_stream_app_on_firestick_october_2020lapyb.pdfIn PDF document text
    • http://csxmoney.info/roxixariduwowewurelakefamvu3u.pdfIn PDF document text
    • http://argo-tourism.com/genie_intellicode_reprogram_keypadmdl49.pdfIn PDF document text
    • http://kolomata.ru/30025686952fknab.pdfIn PDF document text
    • http://dujosibixejo.22web.org/xigixevevatupoxojopexefa.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/vapurenaxekafo_sasumidodab_bizaji.pdfIn PDF document text
    • http://opticsystem.website/czech_republic_eurovision_2018_performanceg9y70.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/3590357942.pdfIn PDF document text
    • http://magic-spring.com/vsphere_client_6._7wneeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butaxogusevi.epizy.com/jumavilobaribobasava.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/mcat_practice_test_with_answers.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/how_to_set_alarm_on_casio_tough_solar_watch.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_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 5424 bytes
SHA-256: 0a22e8d52f0bb1077233f45a4f9e2ace0587e5968c2c7ea21068b67a06e0122a
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10392 bytes
SHA-256: 032c2fa4225cd0c1aab7092510e9a0282a632c4dc6126dc8b1de2c86967024b3

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