Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b3c60007f11481…

MALICIOUS

PDF

79.9 KB Created: 2021-03-16 09:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b756e90f87040b002e72ae9a18c308ca SHA-1: 5883219641706e0a4ca203944d8b342ba25bcd7c SHA-256: 23b3c60007f11481456e455ca5a8d24499e7d3bcbc114ffc04e9c99a24916803
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents, suggesting a link farm or spam campaign. The primary malicious URL identified is 'https://maypoin.ru/award?keyword=salmos+hernandes+dias+lopes+pdf', which is likely used to direct users to unwanted content. While no scripts were explicitly extracted, the PDF structure and extensive URL usage indicate a malicious intent to manipulate search results and user traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/award?keyword=salmos+hernandes+dias+lopes+pdf
    • https://cdn.sqhk.co/bedipidis/jcuigic/68610912538.pdf
    • https://cdn.sqhk.co/safajoju/ii2gfQL/webnovel_beauty_and_the_beasts_chapter_115.pdf
    • https://cdn.sqhk.co/pifizumux/giieE3z/demolition_derby_pa_2020.pdf
    • https://cdn.sqhk.co/pufuxarabo/djcFrUr/33947896751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_ee46a89fbf5843cf8e292fbba2912dee.pdf?index=true
    • https://s3.amazonaws.com/kesumasaka/zelesogukiw.pdf
    • https://s3.amazonaws.com/zarelusipofox/85467445820.pdf
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_c1df2553c3914a0fb475ce36e6f323f8.pdf?index=true
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_a61265fca24247fda7994fb74f5e1062.pdf?index=true
    • http://nubalitedeb.epizy.com/bug_bounty_tutorial.pdf
    • https://s3.amazonaws.com/tojazudibumogab/chisana_wireless_headphones_manual.pdf
    • http://sabukizazuse.epizy.com/ahir_shah_mash_report.pdf
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_71217bde3ea9444fa7197ed594975578.pdf?index=true
    • https://s3.amazonaws.com/potofaw/pububepusomonabodot.pdf
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_10bf9118b7d84c68ac78127edbbb11ed.pdf?index=true
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_7657adbad32e4271803344d9101cd9fa.pdf?index=true
    • https://s3.amazonaws.com/falejogajir/organize_bookmarks_in_chrome_android.pdf
    • http://dowovefedomo.epizy.com/49261590126.pdf
    • https://s3.amazonaws.com/zevutebulaworel/star_wars_movie_moviescounter.pdf
    • http://misosemarimo.rf.gd/application_form_for_australian_business_visa.pdf
    • https://s3.amazonaws.com/xupimaral/what_are_entrepreneurial_jobs_in_the_nutrition_and_wellness_field.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62d.bin
2ffdff6523d2b935f615f67a14f3fa2fbd5bab0a602a3035721fe9490f4d6ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 5384 bytes
font_01_sfnt_off0001084b.bin
de30b516a1999c801924064103269b3d2726b45e6f5e6e02af70a3719fecd00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 13580 bytes

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