Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d03327ffe94fe64…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 10:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8558844c9087eac1e6532511fe5f2912 SHA-1: efdc5efee8abf1c0a63210935b7222aefc2de35b SHA-256: 3d03327ffe94fe64f0ad08af81742f06846e5e2c1f75ea2abe0809749a685f0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, further suggesting a malicious intent to obscure its true purpose.

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/123?utm_term=rosemount+3051sal+level+transmitter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416322/normal_600a28bdc468f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5feb60291d38f.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/how_to_draw_a_simple_girl_figure.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/xamupedezuk.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/does_juice_plus_tablets_make_you_lose_weight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_6037c4d80a8e3.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/movado_series_800_gold_and_silver.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/31030357198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_6039c85e4fab1.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/suunto_core_all_black_review_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484375/normal_603152dc37aec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5ffe54c6e18e5.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/rejovimupusapuvuxuvinumel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6035dd175abd7.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/how_much_is_my_necchi_sewing_machine_worth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5fcfb32f0a913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_6001e9d38c083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 5380 bytes
SHA-256: 9de8b8ac8ea34e1e4b0bf27ea9691bad30be776a316948d8a6043e58190e30b7
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 11604 bytes
SHA-256: f39673ce6b608c10cce4a14276f6f0099e440e7dc3cacf616b3fc7c8988996c1

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