Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7c5af8dfb69c7d…

MALICIOUS

PDF

82.2 KB Created: 2021-03-27 17:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 99b8064ff53cdb2263103219878e2279 SHA-1: 7eccc3ac7510ee091a75247601b15ab60d9031b7 SHA-256: db7c5af8dfb69c7d36e40040a71dc44f4939b283e497ea5358865baa0f17efa6
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to job search terms, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=creative+project+manager+jobs+atlanta In PDF document text
    • https://cdn.sqhk.co/pesuxitum/tsk9cib/persian_calendar_1399_download.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/GGjbjxS/23996454050.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/76945082752.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/7cce26a55f2e748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6056f2b591c17.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/how_to_connect_turtle_beach_stealth_600_gen_2_to_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/huLgiji/octopus_vs_squid_nutrition.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/g2jbgdD/javascript_random_64_bit_number.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/jarekikizanejelulibib.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/jeIphg5/live_price_of_ethereum_in_inr.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/antecedentes_historicos_de_los_derechos_humanos_en_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_605a3a587aa26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofepiropi.onlinewebshop.net/xasajojekenogawuro.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/is_the_raven_a_true_story.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/transcendental_meditation_technique_free_mantra.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/amc_8_2020_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/46894293969.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/appsc_aso_previous_papers.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/what_does_audacity_mean.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/badavobate.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/mac_os_x_10._7_5_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 5436 bytes
SHA-256: 1d9c70e38bc838e1c620c76a7e0920454fea60965e3be5ac57b3a496256f4688
font_01_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 10948 bytes
SHA-256: 57940952d10ed09bd1c0ed6daf96862615488145763ca8d31660576246647214

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