Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5b869570d8a51c…

MALICIOUS

PDF

75.1 KB Created: 2021-03-09 22:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7be09949c67cf1e07ed01bdd0dad37d8 SHA-1: c21aeab6e5596ab41e5b0d252dec19510c48612c SHA-256: 1b5b869570d8a51cdf0f01ae3e00cc760e4ca21dff2206452d1a46b9afc58ea7
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 0.9997

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://jacksth.ru/wix?keyword=mig+welding+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/rizikodeni/Yhez0no/zafiluguxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/Dighiig/fast_download_manager_for_android_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/dy8hjfd/to_do_list_apple_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/j0gjChc/etrade_vs_td_ameritrade_roth_ira.pdfIn PDF document text
    • https://cdn.sqhk.co/zegapoxasut/RJjdsib/polejuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajibile/xakigopefefefarorenuwal.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_c8c6794893554418be6a7a9cfa7d83f5.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_d9b91cf96f2841d388a45fb87dfd5f6f.pdf?index=trueIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_8f27a75a2fd4424d8e95f21896bb316a.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_0e2a1f011d8341578f9767c88b9cde78.pdf?index=trueIn PDF document text
    • http://lekozuni.epizy.com/punctuation_and_capitalization_test_with_answers.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_5dd3fe84fde94ab789ea29ee61a003e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/vowozakaxizobamazut.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/8174471627.pdfIn PDF document text
    • http://pipinodojo.epizy.com/absolute_value_function_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/44916044551.pdfIn PDF document text
    • http://papagasevorikaz.epizy.com/chale_aana_full_video_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/pukorixokirijonum.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/how_to_use_daily_gym_resistance_bands_instructions.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_04d23c834ed047adbe24a9eddd38f93f.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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5432 bytes
SHA-256: 5b5700aad5c1b80eeb92a851ad54f51a00ca5879312d55d66e5c995915dbf6c2
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10348 bytes
SHA-256: 383b3f0f8c6262a9b2715b40492e996ad24bf1785e1004e543a3b66e238ffc0d

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