Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31706cd1a3d0d86…

MALICIOUS

PDF

103.7 KB Created: 2021-03-31 00:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64b2903ae507b7027e47ad40ad40158d SHA-1: 2a45bac46d26fda85e0a92353a3d1c2003539d8c SHA-256: f31706cd1a3d0d869a6d46c7976fb95b5bd4e9e0708b6759745bec06c3df724e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains or are part of a link farm strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=captain+underpants+books+in+order
    • http://firstsecu-paypal.com/7531516976610b47.pdf
    • http://vataponuxizeliz.mywebcommunity.org/movusasutevexigebakezi.pdf
    • http://copyrightshelpscenters.com/jatezipawapaxawewisulaxiu856.pdf
    • http://pefilimozol.iblogger.org/48751219192.pdf
    • http://jofufunobek.sportsontheweb.net/how_can_i_build_my_neck_muscles.pdf
    • http://tixesikixux.mygamesonline.org/92175096922.pdf
    • http://gulonibujivul.iblogger.org/8193885826.pdf
    • http://rebelliona.online/zeponezenezakajarkjkgl.pdf
    • http://fakts.design/anggun_mimpi_lirik_chorddd7he.pdf
    • http://novuvomedo.iblogger.org/xefigidikikamorot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisiwanolom/besetesowexibugebaw.pdf
    • https://s3.amazonaws.com/wemazun/zeziguji.pdf
    • http://gigupagupefexo.epizy.com/organic_chemistry_notes_class_11.pdf
    • https://s3.amazonaws.com/votuweroxigezog/vogoso.pdf
    • https://s3.amazonaws.com/sizabo/jupabeguselekezakevita.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_ae4cbf19cfe945c89c1625c9b641a07c.pdf?index=true
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_c1c807d4153442a5ad37f415497d5c29.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_718db7d121bf4eaf9fe5862f35e79e51.pdf?index=true
    • https://s3.amazonaws.com/xalexojaxipud/dipuxebis.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_c21a2dd93b2f4ae3a4166c05119dd634.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_24f07e587ea44ba8ab23436399951a2a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001454b.bin
3f8e6c8f1179efdfd347f5ad17a9ea4cf38dfe273ca2d7520e1ae2b45f3bb0c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1454B 4884 bytes
font_01_sfnt_off00015681.bin
770ab400654e8a37826ab38787597ab054085cb12fe01960d337fe40d1bd48eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15681 5032 bytes
font_02_sfnt_off0001679f.bin
4ca9720e38eaea1a4591d43c828c0715396e6effbc6db843a4bc4fcc75cb43f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1679F 12380 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.