Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a4c5bde755888a…

MALICIOUS

PDF

84.3 KB Created: 2021-04-20 01:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f27e682597ef418608a9f5791d7cce3 SHA-1: bac780380907d7e141b5d9f923c221808547681e SHA-256: e7a4c5bde755888ab43230880e72afa0a7b006283e422d0af93cfe95792744e9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=triumph+bonneville+t100+harga
    • https://cdn.sqhk.co/jisaside/chopMHw/helicopter_crash_chernobyl_youtube.pdf
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/ruxiwulutefer_wavepagitubuzix_nozanuv.pdf
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/mupewusur.pdf
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/zekisala.pdf
    • https://tikamujajinug.weebly.com/uploads/1/3/4/4/134467206/9050537.pdf
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/5183869.pdf
    • https://cdn.sqhk.co/dowusutitozi/ha1I5je/xelezegoxo.pdf
    • https://cdn.sqhk.co/fowizolomam/jdijdit/weed_farmers_market_michigan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef4b7995-c097-4c5e-b967-4f38d8c29c3a/what_is_the_lesson_of_cupid_and_psyche.pdf
    • https://uploads.strikinglycdn.com/files/63dc3a3f-b7fb-4373-8538-20278ea8dbbd/taco_bell_quesarito_nutrition_info.pdf
    • https://uploads.strikinglycdn.com/files/be5014a3-63e6-4d40-9712-107741ed870f/zuzebeneke.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_1b6096623c374d4f9750235bd86fb405.pdf?index=true
    • https://uploads.strikinglycdn.com/files/471c1b73-cbf2-4a61-b034-d8ef3919a4a6/51403501542.pdf
    • https://uploads.strikinglycdn.com/files/10c9c33c-a099-4aef-bbed-b3d7654e37e3/the_adventures_of_huckleberry_finn_oxford_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3bfc2a43-6df1-46f5-9d7e-10d508414884/rime_of_the_ancient_mariner_summary_short.pdf
    • https://uploads.strikinglycdn.com/files/e8355824-a3fa-479d-9f9d-9785de7b3d76/15607691092.pdf
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_b7a40735f6e8454ea34ea7f9269a61e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/33bcedd2-1c34-450a-bb59-a2b47cd444b4/1983941202.pdf
    • https://uploads.strikinglycdn.com/files/2ac5e189-7069-42ba-8a6a-d58480929bd6/55450294539.pdf
    • https://uploads.strikinglycdn.com/files/a8388a17-3a9b-48a9-b29a-b9a5f971de48/xononodekadijabokot.pdf
    • https://uploads.strikinglycdn.com/files/39daee27-a3c5-4386-af08-2be530c4911a/lanijaduzopuniroxeresi.pdf
    • https://uploads.strikinglycdn.com/files/8ca1b150-463c-4364-a57d-c330fc90c01c/best_graham_hancock_podcast.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_off00010de3.bin
8f852a1c966ada87437177546e1ed7298a292f73ed90ccdd69f24154ec21c60f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 5396 bytes
font_01_sfnt_off0001201c.bin
00f80d1194aafde4476a3b97f1c8f7c2efc6519f2903213e3ec536f962069562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 10672 bytes

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