Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0ec8e5554c37d0…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 01:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2fc13ac017c1df9a99b8a481a105fdd6 SHA-1: a40621acadb063acea7ca89b821c57e8050fe50e SHA-256: 8d0ec8e5554c37d0f8d40fae2b5b094612c2445b2637ca1f695c02838a218dad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to domains flagged as malicious redirectors or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or lead users to malicious content. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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=gospel+backing+track+free In PDF document text
    • http://tejovotemikodes.getenjoyment.net/jungle_book_characters_cub_scouts.pdfIn PDF document text
    • http://mestorating.ru/cowboy_boots_near_me_cheapktg24.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/galaxy_watch_2_bandsvc2e6.pdfIn PDF document text
    • https://vadanidubaseb.weebly.com/uploads/1/3/6/0/136089859/tebiku-pifiwa-pinajasibebi-zejag.pdfIn PDF document text
    • http://help-nanny.site/free_resume_template_word_behancetep92.pdfIn PDF document text
    • http://lozhobelir.space/sample_questionnaire_for_market_researchqegd8.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/paleo_diet_7_day_meal_plan.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/grammatically_incorrect_sentences_worksheets.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/does_shatter_me_have_a_movie.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/batevuja_ruxudodij.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/42962031090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb18b69-0e20-45a2-ae8e-fdbe3603ddce/fright_night_at_freddy_game_online.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/93315523450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3970281-3e23-44e5-96f3-dcde43b64d5b/jetubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bfa2cd-818c-4fa2-8ef4-34cf3b235372/53175733400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c24ebf-c75f-4687-9ce4-1f3c8644ab63/newitezizi.pdfIn PDF document text
    • http://panurimo.epizy.com/naglieri_nonverbal_ability_test_practice_free.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/selojunabuwamiwedefezuwef.pdfIn PDF document text
    • http://buzidasore.rf.gd/netbeans_8._0._2_for_windows_7.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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 5420 bytes
SHA-256: f00037b62556bb89d167a4f2660823614c5cd7bd22691834c79b0ce56f8bdf9c
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 11004 bytes
SHA-256: 7accca8b76a300fe70336c7b0bdf74344e1fc3baaf321aafba2ade1424dc03a2

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