Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbe7982959a36ab…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 19:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0326df6f3000859a4558649b7babd64d SHA-1: 21de18001930baa0030685940eb35eea6b9e5557 SHA-256: 4bbe7982959a36ab9bc18df0f7f57b1ccd54b3619066640f5905fb8e8071fa4a
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 phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure points to a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=hp+photosmart+c3180+printer+drivers+for+windows+7 PDF link annotation
    • http://xuvaxujogilo.mygamesonline.org/are_ford_maintenance_plans_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/pesunexaxak/ihie7HU/baguwijabewujumi.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/xisovewolunegeniduwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_602416fe0d3db.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/bromination_of_phenol.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/1hjcihh/84867707479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418192/normal_6007a799c4c1d.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/list_of_basic_words.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/euro_pro_x_sewing_machine_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_601f02c07af23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_60172369e637c.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/axis_bank_rtgs_form_fillable.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/bootstrap_glyphicons_cheat_sheet.pdfIn PDF document text
    • http://jarisudowapebi.sportsontheweb.net/96878932134.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/5DE6Ajd/wukomijeruwunuxomad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5ffcf2377647a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojuzogip.myartsonline.com/46834425324.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/a_view_from_the_bridge_full.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/amoxicilina_bula.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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 6108 bytes
SHA-256: 4a5555f0f468451985852a4449f8383f38a35b9a332fe3776ef3989b70220871
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 11228 bytes
SHA-256: b1ec1925069e1364108ec7c12dee6f401a5b604146ed6c98f98aba491d1c71a8

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