Malicious PDF — malware analysis report

Static analysis result for SHA-256 4807519b2c6ec908…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 13:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f8db37210549866a5fb8cf9a946bb3d SHA-1: 3111d73dee74d5cf0136fa9ce0187082f4827540 SHA-256: 4807519b2c6ec9086e7490585cf37bc5161f8476d8052bcd1a3abfbe7e58a508
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://fokemale.ru/award?keyword=burglar+alarm+circuit+using+scr+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422134/normal_60252e7b31461.pdfIn PDF document text
    • http://sadesopawu.iblogger.org/wekifomujog.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/jigjghi/desokegupetunodolep.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/aggKcjb/waukee_ice_cream_shoppe_menu.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/how_do_you_calculate_geometric_mean_growth_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/eePih0u/32694646379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6049432e11cbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafonoxerinomif.epizy.com/addicted_to_pain_book_free.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_4a905cdf2ae74baf8937dadf73742a47.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_1933078d2bcb4539b688d42d1a13ca39.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_617cebd8cde64101967882bc6579d211.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_e162a38644214e748d4b9e699feb455e.pdf?index=trueIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/2013_subaru_impreza_limited_vs_premium.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_e33b3880166f48f3a4d068b3c13e55ca.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_a9889935ea8440bb8891f201eb7e01ed.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_5a054b920376407cbc85e007af3c7a1d.pdf?index=trueIn PDF document text
    • http://mukanebesiva.atwebpages.com/learn_python_the_hard_way_3._6.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_eab1c7df3d244e15abafcc88ac9a941e.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_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 5524 bytes
SHA-256: 45bc27b27960d7b25ce3717b88cbda074a03accf5029556df36935b3a9a5148c
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 10432 bytes
SHA-256: 1ecdb00b6aed0154b78d05031c67a71c84024ba4c8d8e40254cdad5b0e1a72f1

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