Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53586fd76c7a448…

MALICIOUS

PDF

82.2 KB Created: 2021-03-03 03:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4e756cc8d43b81f786a2e5f22e732619 SHA-1: 8cb327a8ad496a74fc25d69b6b8d56325720c95c SHA-256: b53586fd76c7a4482a31f9503ee7676c06f75c7943a1ae64c49ba2b33027fa5b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=chick+fil+a+kale+crunch+salad+recipe PDF link annotation
    • http://ganitigusawev.mygamesonline.org/94468796378.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/noxelijubefobeponewusaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nixuzosa/hihigY5/talking_dog_commercial_2019.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/how_to_find_dc_motor_efficiency.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/93347945262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_6013cd694f520.pdfIn PDF document text
    • http://itanto.space/durosofijaguxeo8ip.pdfIn PDF document text
    • http://itsnat.space/905621965908cxef.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/jd5ijXT/sigasume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/how_to_read_lexicon_ethics_for_upsc.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/40785022012.pdfIn PDF document text
    • http://vijevumoni.epizy.com/jubijezigu.pdfIn PDF document text
    • http://funadorexizuju.rf.gd/perguntas_de_casal_quem__mais.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/perdona_si_te_llamo_amor_pelicula_italiana_canciones.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 5212 bytes
SHA-256: cc3861200523fc28391fd7eef819b21bc4922736ce6f2528e9e913d54420fd9d
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 10864 bytes
SHA-256: c78e306ce2a088d85c9746b3091042de8f7cdc17fbd000aee68eb837757e6bf8
font_03_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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