Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e8328ecf00f53…

MALICIOUS

PDF

75.2 KB Created: 2021-06-05 19:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e3f08886beef7e4fe29826144e9fc794 SHA-1: 51c5f45fc453d6177c034456d706ef392a15efcc SHA-256: b65e8328ecf00f5318e33b7daa17cf65e151998fb3180ea7758d4d22efdfe232
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 hosting, and is flagged as a link farm. The primary URL, 'https://garglob.ru/pbw?utm_term=best+online+games+for+android+download', is presented in a context suggesting a lure for online games. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://garglob.ru/pbw?utm_term=best+online+games+for+android+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467036/normal_6059688c3618d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_605221139f4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_601aec5912e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_603261e558677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natetusiwuwo.pbworks.com/w/file/fetch/144595173/18_wheeler_3d_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab7f485-af39-4bb5-9845-125880772b31/mezorowo.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144439092/chemistry_matters_2nd_edition_textbook.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144533946/how_to_turn_off_beep_on_samsung_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480b8584-a00a-4646-b86c-d74cd355eec6/sakepazelafizelerunupiwo.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/dewufuwup.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/kudi_mainu_kehndi_video_song_download_bestwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80dc00df-f5ec-4be5-a9ca-6350123ec202/wazumezisipu.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/f/waselodiwezalotivilofaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151ed7b5-251f-460a-88ae-cebb9c60091b/what_is_the_causes_of_celiac_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b4153a-5dce-4cf9-8ee4-620f9bd87121/kenuleti.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144518577/lamivapagavavimesiguzugij.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144504774/what_ford_vin_numbers_mean.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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 5368 bytes
SHA-256: 05ba3eeee539ffe56d5bc1f5d52167a6ecf18c92ba01b8e971ea412c87e0448c
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 10280 bytes
SHA-256: b317c2122401785a13680759783b210cf3830440ba7a5e5c6ab03c513658c329

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