Malicious PDF — malware analysis report

Static analysis result for SHA-256 b066e4f034bc57fd…

MALICIOUS

PDF

71.3 KB Created: 2021-02-24 03:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1bf8c7b88846e13e237bc98cd7f53446 SHA-1: f1156dd56ea1d01869900c9f191facff94b57f2a SHA-256: b066e4f034bc57fda6f1421135ddedcaaa458925006b00b8c2a3084481b5048a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be a link farm designed to redirect users. The document body, though partially obfuscated, suggests a lure related to a periodic table, likely to disguise the malicious redirection. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

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://druttle.ru/strik?utm_term=tabla+periodica+en+espanol+para+imprimir PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fffb8c9c1f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5fdbc126504a7.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/jbmnhc3/online_shopping_uk_groceries.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_6001f5b96ba95.pdfIn PDF document text
    • http://everydayy.fun/xikedev2t9h.pdfIn PDF document text
    • http://megalit-korolev.ru/rhetorical_grammar_for_expository_reading_and_writing0938v.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/G8iejcb/prayers_to_thank_god_for_his_blessings.pdfIn PDF document text
    • http://universe1.space/craftsman_speed_start_mini_tiller1ls0w.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/complications_atul_gawande_read_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_5fd2201780f77.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/xovuzilorazupojofapekofhr7d4.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/jjNhjek/kilusejefefavolejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6009fdd1b2376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_602ed0f07ceac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444096/normal_60050f9c6f5ba.pdfIn PDF document text
    • http://strahauto.website/salumasio3d6h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://towuvoti.epizy.com/ebay_mobile_app_apk.pdfIn PDF document text
    • http://sasavinoseg.epizy.com/how_to_put_something_in_slope_intercept_form.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 5308 bytes
SHA-256: b0bba1b17bdf47f9af0f5bf7b1e75638c2a519a6970a4247f73d4f93437c5176
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 11344 bytes
SHA-256: a44ee2c2d441c8f8d002affd001a04ad54863c035028f07aa9aaffdf1e18cfc0

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