Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4204350f23828bb…

MALICIOUS

PDF

141.0 KB Created: 2021-02-13 07:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c633a8df0885209d530628762b1dced2 SHA-1: 17a949a9f65e0d4416cfad150dfd83a741fc548b SHA-256: b4204350f23828bb769730c8c632b57d50900d8a7d8ef0cb266c3dcb255586ae
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of creating a large number of links on disposable hosting, often used for SEO manipulation or to host phishing/malware. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/123?utm_term=phantom+forces+unlock+all+script+pastebin+2020 PDF link annotation
    • https://cdn.sqhk.co/zururodi/ghBoagg/pagerefi.pdfIn PDF document text
    • http://fortuneocredit.com/48930115316yxtoq.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/hajjhcf/romesijom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_6019932a1a41c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_600ea69696035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378855/normal_6007471cc71ea.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/OuHiaij/subway_fun_runner_endless_runner.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/jonoxusovam-polan.pdfIn PDF document text
    • http://www19216801.site/danaderowaakh7q.pdfIn PDF document text
    • http://kirerela.iblogger.org/hyperlink_image_google_sheets.pdfIn PDF document text
    • http://guitar.su/uos_ma_admission_challan_formlsmrr.pdfIn PDF document text
    • http://faromobipon.22web.org/2075355507.pdfIn PDF document text
    • http://tricitysikhs.com/followers_assistant_lite_old_version9dtf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fea0c7109518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawexega.epizy.com/gawuseralexiweritidixi.pdfIn PDF document text
    • http://xulaseg.epizy.com/consumer_reports_digital_subscription_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/lurinivopaguninetaz.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/globo_aerostatico_en_forma_de_avion.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/39588621729.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001f768.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F768 26428 bytes
SHA-256: 18801924d4adf389eeec091f9677a7106387e3281489fdb213cb1485405f670f
font_00_sfnt_off0001b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B88D 5732 bytes
SHA-256: 7e3b0cbd0cca35413ed99d00f726a47b2fe49be62cb7b4d3317ad3ce91728c9a
font_01_sfnt_off0001cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBE5 13060 bytes
SHA-256: a9f4f17998a6ae37b13a50e25f545784d461cdc1dd90546722506374b5fa4360

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