Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fc21faf113c6a9…

MALICIOUS

PDF

92.6 KB Created: 2021-03-22 05:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 874f55da2c1755e280a1f5ad51d9f09d SHA-1: 70593edc7aacdc54e16df819cf8e2ed5100bd286 SHA-256: b0fc21faf113c6a9b9de27eb4b72c648eb101d4dc90ade00c55be4ad6fa176d5
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 0.9988

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://crophysi.ru/123?utm_term=free++angai+geet+for+small+baby PDF link annotation
    • http://ayazshabutdinov.club/examples_of_formative_assessments_in_special_educationufdnk.pdfIn PDF document text
    • http://reactivascotia2020.com/66285200195hjow1.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/nupujo.pdfIn PDF document text
    • https://webegoxu.weebly.com/uploads/1/3/2/6/132682681/4a4969f.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/jivitukuneravom.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/can_i_substitute_vinegar_for_keurig_descaling_solution.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/12567093935.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/78149349497.pdfIn PDF document text
    • http://xozonline.ru/jenomiwonelogowepewulaqi0m7.pdfIn PDF document text
    • http://neuroncraft.online/whatsapp_fett_schreiben_androidkcxe1.pdfIn PDF document text
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/8464113.pdfIn PDF document text
    • http://stickerrus.ru/bajej4wnaa.pdfIn PDF document text
    • https://xonufixusunex.weebly.com/uploads/1/3/4/6/134610533/jatirugesikefedusu.pdfIn PDF document text
    • http://toppiksnack.xyz/90027968493puka5.pdfIn PDF document text
    • http://cactusvpn.live/redbubble_coupon_free_shipping9b05f.pdfIn PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/fower.pdfIn PDF document text
    • http://reawont.online/sogutapajomibepemopel65ci6.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/7155271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e2a8ace9-feab-46a6-8f7c-eac615464a59/best_friend_google_form.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_16e9b09104c449b39db0d2b759ca6043.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3eeda3-17d2-48b4-a4a5-ba168c729d06/daily_christian_affirmations_app.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_1bde1318b0f949c88c4aa5b8c3505390.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_dff3d462ba434b9ab4104e06f486a1e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1ee0b3-9fd5-46cc-9e01-5c4290655db1/xusosamobufexetulurizame.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 5072 bytes
SHA-256: 5ca5a592b960eed46751df0c70015716c9bc33228cc89f73886e69db879b3743
font_01_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 10840 bytes
SHA-256: ea6a46c85b00abc4668c42ecaf4498c1adb6a80e6e01776c2646119b158c2ebe
font_02_sfnt_off000157f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361