Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb2ba23678a11d1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-29 00:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88af9a66c376fbb53b62260bb7ed1175 SHA-1: d881450379ad88a1ce0409eb2d3c04a4dd593f48 SHA-256: eeb2ba23678a11d178453bdd98aa885f865d4d1ad336b7614428967594f87e15
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of numerous external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://gimoguvi.ru/award?keyword=amadeus+training+guide+pdf
    • http://bagomebefekixob.getenjoyment.net/qualis_capes_lista_completa.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/lofaxexan-raronizilojo.pdf
    • http://palawawez.mypressonline.com/ap_psychology_sensation_and_perception_practice_test.pdf
    • http://pubgucbayim.com/what_are_the_different_types_of_light_fittingsrnevl.pdf
    • http://desajegurake.scienceontheweb.net/xodegafisesi.pdf
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/1225778.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_9701c48deaaf415ca67339141ea6ef05.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_6d3258d351074b0289d72a3185f36756.pdf?index=true
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_70791da4d3214001963cddedf3d3d8c5.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_9da5ea265a23481ca7b89c6279634b9a.pdf?index=true
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_bf920b5d4bae4639a82c5db56ece976f.pdf?index=true
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_5444800f4c9a4d9d93ee6d2393e487de.pdf?index=true
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_dfd74e2858f94863897ba87fb264d877.pdf?index=true
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_6b2d77cb347a496e96e7e238478dafe5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc1f2087-2999-4525-8e91-ee9cf4dc80be/16585974258.pdf
    • https://uploads.strikinglycdn.com/files/daef11c1-a588-47e9-bc1a-b982a34f1e40/how_to_clean_a_krups_coffee_maker.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9e.bin
333b97e6e08db8082880c3e5873137da4f937a45e5e5b694bca2dfc999ec6d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 5320 bytes
font_01_sfnt_off0001119f.bin
44ba8fea270a47605ea7a5c46c3a5484ca1bef64e69efecc7009082b94913306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 10824 bytes

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