Malicious PDF — malware analysis report

Static analysis result for SHA-256 86435a883b73b814…

MALICIOUS

PDF

87.1 KB Created: 2021-03-08 20:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99a6228de7d36e08bc2881886dbe5f7f SHA-1: 0868faa41e47d75acc46692644ca70c097f1f66a SHA-256: 86435a883b73b814debbbf456eca1092cdf37caa3690dba51ab63677bceee30b
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a spearphishing attachment, likely leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=the+bloody+countess+alejandra+pizarnik+pdf PDF link annotation
    • http://lozomaneje.getenjoyment.net/the_kiss_quotient_book_download.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/acting_out_culture_james_miller.pdfIn PDF document text
    • http://copyrightsupporteds.com/78400456981dyg0t.pdfIn PDF document text
    • http://axecheat8.xyz/charge_dipole_interaction3lb55.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/judexugoru.pdfIn PDF document text
    • http://arfesopt.com/android_tv_on_pc2k1w5.pdfIn PDF document text
    • http://keto-menu.online/succeed_in_cambridge_english_proficiency_8_practice_testswh4gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://poxizigifami.epizy.com/duponopukosuvososixe.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_592d5ed7ea1d4f3aa8c248302392b93e.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_9d17f523825f4f11b4fd5fd395b2ff0c.pdf?index=trueIn PDF document text
    • http://novogizeboje.myartsonline.com/68549757648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa2e0a9-440c-4683-b93b-4ad2f090a795/petsafe_pif_300_reviews.pdfIn PDF document text
    • https://0064f1d1-54c8-4480-9b3d-4454d2540f11.filesusr.com/ugd/b0b521_0542084e1f3947f0811d3bdc7936122b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/385825c3-c1bc-4cb2-a708-26572b4c9282/logical_load_order_skyrim_xbox_one.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_7b429bf3c3c74e9db5b313e6d1c73170.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_dd1067cbd28f438f81c5daf9bec5ec9e.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_8429aa99be3f4c22bd893a7d198b0296.pdf?index=trueIn PDF document text
    • http://niwurekatexo.atwebpages.com/mamoluvus.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_8380e088292c41588f680236e5e568ea.pdf?index=trueIn PDF document text
    • http://nonosolagosev.epizy.com/chernobyl_hbo_web_series.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 5504 bytes
SHA-256: 954aeb07199416d0be1bef9e66dcf106ee776e625f4bc2d7b167df106e682b31
font_01_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 10276 bytes
SHA-256: c5a0935b4c4fa16f3520c4e80dd4276856803ca164e3478957d412df5076b494
font_02_sfnt_off000140e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2