Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c771307915497a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 12:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2d08a2bfa25b3b3daaefb94654adce5d SHA-1: ddc453fd1b138d226a808876436c8371c100f234 SHA-256: 75c771307915497a918a335cd88bff78cc30b8e9a942d89745860ec68d699bab
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous external links and the PDF's structure point towards a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=equation+of+a+semicircle+graph PDF link annotation
    • http://zilitimo.getenjoyment.net/download_to_excel_converter_online.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/como_sacar_una_fotografia_digital.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/forinukoda.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/iit_foundation_maths_books_for_class_8_free_download.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/vimudoporelikuwizelofowe.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/69501556482.pdfIn PDF document text
    • http://timinome.getenjoyment.net/filipino_cuisine.pdfIn PDF document text
    • http://tixshopclub.space/70940402772fkwph.pdfIn PDF document text
    • http://islemleriniz.org/krups_beertender_b90_vs_b100aeoou.pdfIn PDF document text
    • http://creditpm.com/kadiniloi9kel.pdfIn PDF document text
    • http://kononameve.mywebcommunity.org/big_data_architecture_framework.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://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_5ece7b031cf3473eb634d91f20397075.pdf?index=trueIn PDF document text
    • http://noroved.myartsonline.com/sullair_185_air_compressor_troubleshooting.pdfIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_e5cee4a7d6834bbebde4099ce0107ec1.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_23c10730c9b34dcebcaa74c7f2f280b7.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_f45c35c458bf4f1bb569adc194dd4ef5.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/fixed_asset_management.pdfIn PDF document text
    • http://kogotiru.myartsonline.com/public_finance_management_act_2020_kenya.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_cbb1f15c03f44356965ec5a73fc0e7aa.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_0f7d8d3215d54641a7081ed55f7b942c.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_fe9b0fbfe1814ebd8f431d87fbc047fc.pdf?index=trueIn PDF document text
    • http://xafamikipu.epizy.com/what_is_a_passing_score_on_the_esl_praxis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 5396 bytes
SHA-256: 07e26e1b4237538b371c3938e1b238e3009cfb95d092d600919c9bf13352c8e8
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 11416 bytes
SHA-256: b9249b4e93a57a654b1d99b06d2b0a7eb749b46eabc1ba009a304e39db7a269a
font_02_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 16144 bytes
SHA-256: fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78
font_03_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378