Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efb87ee0421ab85…

MALICIOUS

PDF

82.2 KB Created: 2021-03-24 20:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cc512346aa8ec6ade1e6d6c88b7522c SHA-1: 9f45a263950a05586b6497db4c096e1a69f124de SHA-256: 2efb87ee0421ab855d76ea654aa5b94aca15a482f5e3ac9a9a99de2a4a3cbef7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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.
  • 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/wix?keyword=16th+anniversary+gift PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483856/normal_60265cf3749e5.pdfIn PDF document text
    • http://svoytrylend.xyz/42811616502a41di.pdfIn PDF document text
    • http://tcerkovniekupola.space/how_old_should_you_be_to_read_red_queenz4z0j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_603966e514794.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/3jfRf0W/94880144739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_602ed9b9c87e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_600a3bea74c60.pdfIn PDF document text
    • http://dreamingdeveloper.com/62289247672a1ihe.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/0qgcjbS/meaning_of_platform_in_computer_language.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/BiiShg2/labefuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_605504531e088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fe2cb1693a5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fe2bf05db7d1.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/fks2Fib/dino_hunter_deadly_shores_mod_apk_free_download.pdfIn PDF document text
    • http://bestita.space/82043972943eo263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_5fdba7f469355.pdfIn PDF document text
    • http://timecodes.net/743128481038cjy4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_9abf986583f34849ac209bfa09d0280f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/js_uncaught_referenceerror_require_is_not_defined.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/yours_sincerely_formal_email.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/banana_song_video.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_10fbc3fc1a0e48fa8ced5c893b955762.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_6031a5000b73477183322537c2c227f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xajowu/nikokorudeko.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/sway_michael_buble_music_sheet.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_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 5268 bytes
SHA-256: cf80600c9f7da9218d5539e91111732bd10dc58240e715d06f5a7f15ad2b0594
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 12296 bytes
SHA-256: a90d4da9b9bbce7e5d88b4c768609884392d0801e5f0baddcb32d0f8e32829c1

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