Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75a0d6866693a90…

MALICIOUS

PDF

68.4 KB Created: 2021-03-10 23:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db43820aa7c7bba59aba47130c453904 SHA-1: 5cd32460be80900c561bf1e4b9550dd3eb3cd38c SHA-256: c75a0d6866693a90fa1c9480a821760ebe1e33cdd447d7d5da3ebae7b5dd550b
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 0.9960

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://soxebez.ru/wix?keyword=genie+garage+door+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459059/normal_60255ac9e853d.pdfIn PDF document text
    • http://piwifeg.22web.org/waking_up_from_a_bad_dream_shaking.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/3784371164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_60344145e74b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_60484a2266f1d.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/lokegireritesebigibuke.pdfIn PDF document text
    • http://zupuvotan.22web.org/c._v._online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritajegowi.epizy.com/luces_de_bohemia_selectividad.pdfIn PDF document text
    • http://bajivuselome.epizy.com/ccna_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/games_to_improve_listening_skills_for_preschoolers.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_47c9e8f705f34bc1931cff080e435b88.pdf?index=trueIn PDF document text
    • http://nekezoxugi.rf.gd/12657300850.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_b6835e867d604e4e9234845c9603d91c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/somusigilinig.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/lab_equipment_activity_worksheet_answer_key.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_dfe858a7dcd744529db3a1f0d66f88fa.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/replace_toner_brother_error.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_a138d49e85a34c6a87008d919c88c4ab.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d0f8653e905a4318ae825ebc2bccf3d3.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_0793a5dcb611443ebc79b7bea75669f2.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_c59fa8aae4a243ba86bb5d7fd8744630.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_54afa0f3293148b09b1f4430436be51e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/zafafi.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/50693458579.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_94c3a2521f34466d984d74c00020ad46.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_1f4dea1b5c714c00bdb8219d6b9473bb.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 5000 bytes
SHA-256: 3dd77fbf2b20dc4ee61ee61ecdf31c2fb1e0f21ccd96e25dafd05398bb9cbe99
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 9980 bytes
SHA-256: d08805508264850b44a6b633fac725143aa4fa29b016c688e2e0421e848ac7bd