Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefb445e09ba896e…

MALICIOUS

PDF

79.0 KB Created: 2021-04-19 21:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 81b901e5146f5d84eb1eb671ce936ea6 SHA-1: 4184300997f66fa30916aa3ac64cb0f829d6e607 SHA-256: fefb445e09ba896e09aa7759f2e59ffd034c523cd44728a40b5efa971925887c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to fitness, disguised as a workout guide to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=bodyweight+circuit+workout+fat+loss PDF link annotation
    • http://zdorovienashevse.xyz/65806542770r6627.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/vuramedirul.pdfIn PDF document text
    • http://creditscorecard.info/15414877597zf81o.pdfIn PDF document text
    • http://wosozage.mypressonline.com/fusionner_2_avec_aperu.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/business_english_vocabulary_test.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • http://bududusawuwepi.iblogger.org/que_es_un_aneurisma_aortico.pdfIn PDF document text
    • http://dmgameplan.com/hp_laserjet_p2015dn_status_lights9q5fw.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/6432852484.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/sony_str_dn1030_setup.pdfIn PDF document text
    • http://dabubavosiwus.iblogger.org/where_can_i_drop_off_used_clothing.pdfIn PDF document text
    • http://hustlinmoney.com/612485338633nvga.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/furatemufe.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/college_majors_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokikigufam.epizy.com/bootstrap_login_page_template.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_5a46acc16dfe4060a9d5c0a9015e2eba.pdf?index=trueIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_4871022abd7a44928182084b217b0033.pdf?index=trueIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_caaff85f7136433f80924080c302d260.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_10f3d5b46e374dec9d98f7820ee09ade.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_50e83a19676f454497e9409cc602125f.pdf?index=trueIn PDF document text
    • http://piredesoki.epizy.com/bayesian_statistical_inference_iversen.pdfIn PDF document text
    • http://pasofotamuteper.atwebpages.com/accounting_journal_article.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_aa2775877bac4807acdc1bec2fe53947.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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 5592 bytes
SHA-256: 8d486cdcf8a15102984f6b4be1984cbb8fdc8edca224cd108b9bc00faaf4ab71
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10656 bytes
SHA-256: 06034c31ef08dd9139940a089dda20419d9e2e0796a8b519ac0329703f7c87be

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