Malicious PDF — malware analysis report

Static analysis result for SHA-256 381182dd2a6b6b42…

MALICIOUS

PDF

78.9 KB Created: 2021-04-06 14:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b636c124a546df3ef9d1fcde0afa047e SHA-1: 8e733cb47b53cafb85fc30ceec050d162e25d2c3 SHA-256: 381182dd2a6b6b422f1454efd55f620173038bb0edda3d212c9ac733b91a994f
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of embedded links, many of which lead to redirector infrastructure and disposable domains. The heuristic firings indicate a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the embedded links suggests a potential for further malicious activity, possibly involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/aws?utm_term=what+store+is+cloud+9+filmed+in In PDF document text
    • https://cdn.sqhk.co/sabumijobude/eqmhchc/battle_for_the_galaxy_le.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/clanbook_tremere.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_is_learning_development_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/aafifgg/fetoxobed.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/godspeed_dixie_chicks_sheet_music66lxs.pdfIn PDF document text
    • http://new-volosi.ru/27463225530z9jhk.pdfIn PDF document text
    • http://myirn.icu/6230715746459fwx.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/50050715800.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/hjN7Ohg/thomas_and_friends_big_world_big_adventures_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/dgghfBv/glowroad_app_download_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/pasar_un_archivo_a_word_sin_programas.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_674bd713139e420d876ec6d55c4fc3fb.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_533c414bfcf54de691212134cdfc86e5.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_4396bba042874e6aa661f913560a91b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/commando_2_full_movie_for_mobile.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_f00cfae023c74b379e7d1a067db9e34f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/tejipaj.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_d853c907407f47ea87541b83903029ac.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_045948cc0a4d4835919ffa552ce8981a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/less_than_or_greater_than_worksheets.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_1c1e8809643340ea912d8cb9792e8baa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/54350277187.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_96fc0e3441564547862840b1f6489136.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/simple_user_dashboard_template_bootstrap.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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 5432 bytes
SHA-256: c8b09896e9cfe57e14592a8d28b82357633d7134a2cfe80b4f8695e901507313
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 10932 bytes
SHA-256: 1fbef32ddd0b9434a3d2aed4beb8a80050f0399b7cd101f239739938b351bf81

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