Malicious PDF — malware analysis report

Static analysis result for SHA-256 3839490c10663731…

MALICIOUS

PDF

69.8 KB Created: 2021-03-14 15:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf4a7d7cb25695e89a4505d008ce673b SHA-1: d4a2aae50acf531b2e9606f6cabbfcb2d3840190 SHA-256: 3839490c10663731f54578f368fd416d8182e1c897f8b6b51f79e2736665a4c7
126 Risk Score

Malware Insights

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

The PDF document contains a high number of external links, many of which point to disposable hosting and are likely part of a link farm. The primary URL identified, 'https://seumenha.ru/strik?utm_term=flirty+good+morning+texts+to+send+a+girl', is presented in a deceptive manner, suggesting a phishing or social engineering attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=flirty+good+morning+texts+to+send+a+girl PDF link annotation
    • http://bamizavol.22web.org/julawixetakuditanita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_6020afb17901e.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/jagjVgc/69440580590.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/2KegfmS/bilodemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_6045f2f660761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_603603747ce75.pdfIn PDF document text
    • http://xazoxaruxilovo.iblogger.org/wejerijaxipidorazaluvabaj.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/jijIUjg/pumpkin_carver_icp_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5ff64f42abf26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_6031d1a365e2f.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/Yhhhhjf/fall_gang_knockout_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/jHCgiif/lefitemed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e03792-817c-49ae-bd80-2a014589e02d/the_great_depression_us_years_in_the_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcd0683-4ce0-444d-9b3e-8068cac47c18/62394080594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c93c93-e285-4300-959e-ae26c15de38a/simple_java_programs_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d5b96d-42af-4ede-afc5-2b231a30d1a6/how_much_oil_does_a_troy_bilt_generator_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0f7824-a930-4e9e-b57a-bb45dbdb895a/nadex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5192837d-4367-44d7-8df8-65a49f785f5b/rimumamorifiwixiwas.pdfIn PDF document text
    • http://lojosikol.epizy.com/junivibufiwoselir.pdfIn PDF document text
    • http://xalanijowule.rf.gd/25777993236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b128c8d2-bddc-4a83-887f-f26d82e8275c/skullcandy_soundmine_bluetooth_speaker_how_to_connect.pdfIn PDF document text
    • http://gemesiwexalizel.epizy.com/best_monstera_soil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17945b6-fb5d-4ebb-99b0-152aceb29dc4/59089186882.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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 5268 bytes
SHA-256: c2efd251321fc3afe9b2218e22dcbb4c563ee2c50a8a26b56a26b90977a1a767
font_01_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 10148 bytes
SHA-256: e62a4787f7b138b4cc39295d881b4010ad23faf9414d872e2fc1cbe814c8de7b