Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad66ba37d43e965…

MALICIOUS

PDF

141.4 KB Created: 2021-03-24 08:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f5dc042d58b9224f75a3809a41f64194 SHA-1: 1f18d0e77c2fcb10a861b17bd2975ddfa9095dea SHA-256: 3ad66ba37d43e965fee37d327b0b56fd479312ee835a2cb91d5174c295f34e42
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a high number of external links, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or content-serving mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=acuerdo+de+paz+texto+completo+pdf PDF link annotation
    • http://fipizilemuwob.medianewsonline.com/what_do_green_tree_frog_eat_in_captivity.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/wave_motion_equations.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/gotop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwolimosopobu.myartsonline.com/what_does_the_abbreviation_wyrd_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0dc555f-a648-4bed-ae27-8573c9db1717/3208119973.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/3145353649.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/how_old_was_romeo_in_the_1968_movie.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_b221721e44cf4b76aecc488f0411109f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a162a79-2ac1-406e-a5a5-e8663234fc5a/what_are_character_strengths_and_weaknesses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ebee0f-3faf-4afc-b434-8bf6e4510214/wiziwemotugilop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b447dd-6f67-47c5-850d-cb5d9d9af447/is_there_a_reset_button_on_a_kenmore_freezer.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_28544a3e74bf4ce7904a66e453149c25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/4572734772.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/82221561462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8466c951-ef99-423b-8d7d-46942491028a/nunifuxekamugekejusojiv.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/papiloli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07552e1e-5596-4bbc-b803-dd01642f58b5/pamijipogoguniwelupipu.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/zitaxudasowekivunapefabul.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_b86cb3bd25d04c9fb812209ef0f53f02.pdf?index=trueIn PDF document text
    • http://fuvarijes.atwebpages.com/bezamebufojolesabira.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/how_to_factorial_on_ti_30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430284b3-4a2a-4458-a9c2-edbf153629db/can_you_lose_weight_with_a_water_diet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D491 5232 bytes
SHA-256: d4a1948c2121b9433651b8a7e1799c71246cfa1eaaa76e197ffcdfc6c4c25b0a
font_01_sfnt_off0001e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E659 13572 bytes
SHA-256: 2b18d89bd16be5e79fc7a3f365b65d1b6fcea5399a13d2ecf391bd6694b6a70f
font_02_sfnt_off00021243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21243 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501