Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aad3b81396b336…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 11:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4db86e6da496763785c22a37783729fb SHA-1: b3c640f1e8999a0f816cec06ffc468c166d8b9d8 SHA-256: b7aad3b81396b33616ce9f65b439f6fabc72c80bb739ea2260a86f033667257c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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
  • 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://xajibur.ru/wix?keyword=alpha+x+reviews PDF link annotation
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/166769.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/bissell_crosswave_pet_pro_cordless_max.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/a_word_meaning_stressed_out.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/dobunu.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/d0b91.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/ziwekeruzoxotewozegi.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/werajezib.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/how_to_calculate_future_economic_loss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulofuza.epizy.com/41082379629.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_0fad0f2cf2f646b5ae28555331a990c7.pdf?index=trueIn PDF document text
    • http://ginokaze.epizy.com/southern_literacy_test.pdfIn PDF document text
    • http://vaxisiregax.rf.gd/is_disney_on_samsung.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_a38ecf418360404ca5850347e17ccd21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/rosanugola.pdfIn PDF document text
    • http://xubejivulovitam.rf.gd/amoled_screen_burn_in_fixer_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/3984254029.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/xujek.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_0a8dd532c2ac416cbd9c043bba8464bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/creational_design_patterns_android.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/how_to_find_the_mass_of_a_compound_in_a_mixture.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/what_is_the_difference_between_centripetal_acceleration_and_centrifugal_force.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/elsevier_journal_template_doc.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/fafanepopasabaguxo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5116 bytes
SHA-256: 455d250bc2a54c966903c99314499a515ddbd52fda215d296b24b05f13aff55b
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 11200 bytes
SHA-256: 1408aa1438d5888a24b16e5541d8fb816607c2daa33b5409aa6d0b3d32ee0dfc

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