Malicious PDF — malware analysis report

Static analysis result for SHA-256 5261564563f5cec5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 06:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4c75c8085966dfc6bd104373ee781e0f SHA-1: fcd368f523482b635150c6ab7b17fafb0678641f SHA-256: 5261564563f5cec5bf0bcc981d64a9e89d3d783ec878d2e7f4f76f8eff1b5f79
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one pointing to `https://midufefew.ru/wix?keyword=introduction+to+statistics+answer+key`, suggesting a phishing or content-luring attempt. The PDF also exhibits characteristics of a link farm on disposable hosting, further indicating malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest it's used to redirect users to potentially harmful sites.

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
  • 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://midufefew.ru/wix?keyword=introduction+to+statistics+answer+key PDF link annotation
    • http://vekvelo.ru/why_is_ammonia_and_acetic_acid_a_strong_electrolyte74elj.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/66956781131.pdfIn PDF document text
    • http://doordash.link/450159346284g7tl.pdfIn PDF document text
    • http://prognoz-football.club/how_many_days_till_my_21st_birthdayq6ce1.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/14345808331.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/65104407190.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/when_terms_are_fob_shipping_point.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwawujabewup.rf.gd/fivoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb5842e-6bca-49cb-9237-734082c9cef3/monisubojujevutosi.pdfIn PDF document text
    • http://pujegadamuj.rf.gd/kuxaxapowibuwilujudokes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604df8d5-a0c7-46ea-8824-32b0c227b0a1/how_to_draw_anime_girl_step_by_step_easy.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/69996546676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1595bfe4-0cc6-4b5e-859d-24d7b3575ee4/58455138210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7798cb9d-6ad8-4896-a538-62da187bfe73/72431585278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c84f796-6074-4e0f-a60b-3bc63982604f/fisazake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f869e5-bd74-461e-82a5-7739aba6ed7d/mackie_cr_1604_mixer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b7011b-f44c-452d-98ce-a40aa0c08dc0/toyota_tundra_radio_wiring_diagram.pdfIn PDF document text
    • http://fumebuz.rf.gd/brookstone_clock_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7dd4ac5-21d6-4b96-8ae5-efcd64f319ed/how_to_change_a_grundfos_circulating_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03e742c-3f0f-4756-a63e-98924030a148/87114263738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ebce20-9a09-436b-bd3e-59662bb33390/xakerufanuloxavasoga.pdfIn PDF document text
    • http://borovob.epizy.com/morerivorogizane.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_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 5096 bytes
SHA-256: 0583a66f372b44ab840d1d754b130a9cdb715e79e164446f61e98be79d53557b
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 10936 bytes
SHA-256: 9ca49a35bbdbc6ef58badda28acbe23348ac051352b5e4827c69dccc575383b2

Open this report in the interactive analyzer, or submit your own file for analysis.