Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24ed9e0c39432c5…

MALICIOUS

PDF

92.0 KB Created: 2021-04-02 02:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b59312e7f8cfe721398033a258e30356 SHA-1: de376e253adff799032e54b802f23a8d3aa9c899 SHA-256: d24ed9e0c39432c5c87afbd77435f04ea00f8d83465a7d41a9f0dae7dedee830
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://pelibifir.ru/wix?keyword=mole+conversions+and+percent+composition+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/dodamewope/25geqVT/34679509848.pdfIn PDF document text
    • http://rudeniwabirever.iblogger.org/african_american_history_textbook.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/wexifitim.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/JVmichf/krispy_kreme_powdered_strawberry_filled_doughnut_calories.pdfIn PDF document text
    • http://it50save.info/rinugug8uv67.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/g7zrP6s/cbse_online_form_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/dqU52jf/3d_surround_music_player_pro_free_download.pdfIn PDF document text
    • http://pagexanomala.22web.org/37191622714.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/notiwofepur.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/zalofezij.pdfIn PDF document text
    • http://neuroncraft.online/kisuvokokinekasavc639.pdfIn PDF document text
    • http://you-bestshop.xyz/your_great_name_sheet_musici7chl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_979a9bca16c24ae4aecdd92fd99a5ea7.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_0bd3a69e9061413a8ad6f14e64db7546.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_f1770c6e0a6b4768b295b34224b13106.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_97846b428e504ea1b2b3579a6b278c5b.pdf?index=trueIn PDF document text
    • http://vusoxererereli.epizy.com/confirmation_of_receipt_of_goods_template.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_1de4d1ec16b049e88db9fec7f1563ef0.pdf?index=trueIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_5a46f7199d0f41369a05a395a86384da.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_32b90f242790438f859b6f81cf9ba964.pdf?index=trueIn PDF document text
    • http://sujevulakaginig.rf.gd/additives_in_paint.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 5636 bytes
SHA-256: 1a1aa380dbdba26a8555fc54c6cb0d1c49cbdca9ee62688995b6127c2aa0db51
font_01_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 11964 bytes
SHA-256: 98aaeb699fd482a7d8df49f025341fa63b0732a60862f959f372dea23f62c1e0
font_02_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 16132 bytes
SHA-256: 82f7aa4fef2cd90733ed84ef1d81c041b15990b82a49830089245cc24b586ea2