Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6489771be97562…

MALICIOUS

PDF

84.1 KB Created: 2021-03-25 00:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8de089012d396612ff2e958c35a7a67b SHA-1: 5b2e69732767b1a5dcc54ee1a15e1eaad9f8b9aa SHA-256: 7e6489771be97562ad0810914fd05aaf153b52e06c3af68cc6b0753875a3068d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lead users astray.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=should+you+read+multiple+books+at+once+reddit PDF link annotation
    • http://gijujelebalorop.22web.org/19088187285.pdfIn PDF document text
    • http://pigexavenume.iblogger.org/53883784236.pdfIn PDF document text
    • https://cdn.sqhk.co/dofowaduz/iajdvx3/jodomewawitopuwudelu.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/wgilgiS/pajakemuz.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/vineziwabixate.pdfIn PDF document text
    • http://wigemefigiw.mygamesonline.org/vufifokomovukosakeked.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/hfhhddB/60959460204.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • http://bilabugova.iblogger.org/fikurabupavumaferuso.pdfIn PDF document text
    • http://vekogevev.22web.org/bengali_typing_software_for_photoshop_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxowofabijis.epizy.com/boditerunepomutone.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_17467124628d4f2b9ea8dee0b46ca318.pdf?index=trueIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_70c743bbe9474f299b18742651b86a15.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_5ff00731fcb64ec6ad8f130f8ab1c1c7.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_365b0d7e167549db9cb1840f9750225c.pdf?index=trueIn PDF document text
    • http://rimaxuj.rf.gd/caller_tune_song_wapking.pdfIn PDF document text
    • http://dizogabage.rf.gd/sony_str-k740p_setup.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_6f8db42c1dc342d6b674a5d67c8beb16.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_e7070089389e481eb39c72c22e588dec.pdf?index=trueIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_477608405dd9482a89b872a03c598368.pdf?index=trueIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_396f2a5a29954d4bb0bf3b7275281d4d.pdf?index=trueIn PDF document text
    • http://zitipibozag.rf.gd/writing_with_style_by_john_trimble.pdfIn PDF document text
    • http://wexaxota.epizy.com/animator_apps_for_android.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_44c108c80e7b4bc3ae170da30d739c2a.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_3df57e8af45e44a7a99bae7002b21f6a.pdf?index=trueIn PDF document text
    • http://dijuvunote.onlinewebshop.net/the_boundary_element_method_in_engineering_a_complete_course.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_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 5724 bytes
SHA-256: 562b92388aab83c65e365680c8bbe3a65e416ebaa0012d8365a80b09b15e6c55
font_01_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10908 bytes
SHA-256: 98fb8a55849d0b9fe579748aa575ec5c48ad320890be3bb7ec31ce97c0a17969