Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a45647d563402c2…

MALICIOUS

PDF

67.5 KB Created: 2021-02-21 16:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 21cae4dfc122069d2c4ac8fc3798cc54 SHA-1: ee64b452c1b40b6abb96c922410dd997a0de26a8 SHA-256: 2a45647d563402c29bb431ee2a5ca7f0b125a136a800bd9f815b644c8ccd72af
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites, suggesting a link farm or phishing attempt. The heuristic firings indicate the PDF is a malicious redirector and contains a link farm. The presence of embedded URLs and the ML classifier output further support malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/123?utm_term=plate+tectonics+crossword+puzzles In PDF document text
    • http://redtea.space/how_to_add_braava_380t_to_irobot_appb0dg3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5ff0b59a0497b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_60318eadd6e2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_60002e440c79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_6007ee62beda5.pdfIn PDF document text
    • https://jurazevogepepa.weebly.com/uploads/1/3/0/9/130969245/joxubujetug.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/sihkphb/ultimate_farm_simulator_all_bosses.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/jibgdbl/turkey_sandwich_recipe_with_avocado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5fe33d9b10871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5febe00e6213d.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/ifEEihf/29535372068.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/gdChiig/everstart_smart_charger_and_maintainer_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/ogN6Cia/56300752295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_60038eb70764c.pdfIn PDF document text
    • http://interior.estate/13769626148zww46.pdfIn PDF document text
    • http://alexandreablog.com/they_say_i_say_ebook_download_free805m6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodirexefakevub.rf.gd/fijiwuseline.pdfIn PDF document text
    • http://rolozipufulelo.rf.gd/christmas_carols_piano_sheet_music.pdfIn PDF document text
    • http://darozux.epizy.com/screenshot_app_for_windows_7_free.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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 5208 bytes
SHA-256: 1fd3d017139b6e7799b853c40d2502e7d01348014f40bc66f15158c01035d822
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 9860 bytes
SHA-256: 98062ed56e91e0c2df47cec4d2a9812ac3418efc2b8340c719df6bcb33a56b4e

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