Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aeb7482407c7e2…

MALICIOUS

PDF

80.4 KB Created: 2021-02-19 23:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c4a79cf7140bd4168008351a0ecd455 SHA-1: daba11b18d949467e5e0b63a248b0a1ba1a41506 SHA-256: b4aeb7482407c7e287f9a649da525939f5bf02111b735684cee11428c7ceab59
186 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 pointing to disposable domains and hosted on platforms like Weebly, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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/wix?keyword=least+common+multiple+word+problems+with+answers PDF link annotation
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/8239180.pdfIn PDF document text
    • https://furogareb.weebly.com/uploads/1/3/1/3/131397930/d880e71e8.pdfIn PDF document text
    • http://apelsins.space/my_appearance_worksheete8uet.pdfIn PDF document text
    • https://fiwarurebel.weebly.com/uploads/1/3/2/8/132814972/58c2721a9f7db.pdfIn PDF document text
    • http://xigujawuruwuko.22web.org/the_burning_room.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/lefewifele_nebogovakej_nofofimaxemuzov.pdfIn PDF document text
    • http://befigter.xyz/598525990124zvnf.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/meberoxoburinufezux.pdfIn PDF document text
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/nezosasa_saxaxefusanokoj_dotalulurok.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/mexatiduv.pdfIn PDF document text
    • https://gizipiwiro.weebly.com/uploads/1/3/1/4/131454158/8433097.pdfIn PDF document text
    • http://puralivivupose.iblogger.org/kofaxul.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/xowejena-bozezeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mimumugemefes.epizy.com/dimetebofexatemi.pdfIn PDF document text
    • http://radetijelatava.epizy.com/image_button_border_radius_android.pdfIn PDF document text
    • http://zarevarepi.epizy.com/83395946612.pdfIn PDF document text
    • http://goseletew.epizy.com/warrant_verb_3_forms.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 5368 bytes
SHA-256: d32a409f5a41ab5194286c6a387afbde0519c77a5eaebe14a5f553bd06559efa
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 10716 bytes
SHA-256: f531aae7886b672ed5a5c5cbcb75c723cdc994fe8cdf5fdcc902f9dc0e7733d0
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74
font_03_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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