Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8249fb6e404a698…

MALICIOUS

PDF

76.8 KB Created: 2021-03-31 02:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 393004db77a889a0cbf2ca9885b9a6d2 SHA-1: 50401e62d5698e4baf47aa84f28d81137f252433 SHA-256: f8249fb6e404a698822fc0318393800f43c404238ec6de3692214f0a2bce3c6e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=how+to+connect+my+hp+deskjet+2600+to+the+internet PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5fdb1daaea495.pdfIn PDF document text
    • http://byseles.xyz/xiwawutonipebudikojafirifoa3x1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_604ead840731a.pdfIn PDF document text
    • http://instapriz24.site/kobisulaloli8tv3m.pdfIn PDF document text
    • http://dekopubetalukaz.22web.org/kezifomuzebabisusowuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7845732f-a50d-4c51-a243-ae109c772df5/49239838846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894acdeb-2658-4531-b42e-fb38dce2fe5f/how_do_i_desire_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871a8c2a-bbb7-46b5-8f70-acb0bb5615a7/danugem.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/netflix_movies_free_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f79eaf1-c8e8-4de5-b0ee-b8d371e695ed/toshiba_television_remote_control_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e67e97-a0a9-4b7d-875a-8b7cdca9833e/how_to_draw_mother_and_baby_easy.pdfIn PDF document text
    • http://podadoperis.rf.gd/lakobikopunifif.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/ocean_eyes_easy_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77eba55e-2062-4f32-bc69-e7be50738988/maths_all_formulas_of_class_11_and_12.pdfIn PDF document text
    • http://faderutapuviki.epizy.com/bruno_latour_livres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fdbaca-5a95-407d-b044-65576477d3d0/does_vicks_warm_mist_humidifier_need_filter.pdfIn PDF document text
    • http://ramogefakox.rf.gd/zeposonagebagoruxopepiwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff1e38b-01d9-4779-8fe7-9699651da93c/30904244915.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_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 5796 bytes
SHA-256: 4ac15f572cf6564b0acbb5b20c86c1472360ebcb78ecee722d759770a7641078
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10420 bytes
SHA-256: 0fd4bc98791ff8736ab51db22cec981154c9fc216f24c1824178fdd52a8cb2e6

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