Malicious PDF — malware analysis report

Static analysis result for SHA-256 403842ddaf20a840…

MALICIOUS

PDF

62.9 KB Created: 2021-04-02 15:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 956a93f41d6df732ab0727ade6290acb SHA-1: 1487813d4e71ec28b8dd578b63c5c6d7cc982bcb SHA-256: 403842ddaf20a8407e249118124ba912cef1e297df0732c1ee66f67db8c1cbfb
182 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's designed to phish users or distribute malware. The presence of multiple disposable hosting links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8280

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=el+poder+de+la+palabra+hablada+florence+scovel+shinn+libro+pdf In PDF document text
    • https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/rodadub_tiwawa_muzotez_mafelawubiguro.pdfIn PDF document text
    • https://woveguzusozor.weebly.com/uploads/1/3/1/3/131383383/8bbb3f60c549.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/cantor_s_intersection_theorem.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ichg1Wk/grand_pixel_battle_royale_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_603f0cbfd28ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fe15e5aa9e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_605129b37a14a.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/bididrG/neha_kakkar_songs_2020_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/bodosuruwalu/ghJUgiM/tiktok_starbucks_drink_white_mocha_caramel_drizzle.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/dpthdjd/legends_football_league_2019_teams.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/edema_pathophysiology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_60518452e21df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_b3511e07b48349d2b8ff576490b3461f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59270e2b-0714-4abe-9d39-20b55e785455/uppababy_vista_2014_rumble_seat_configurations.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_4bd46bd7193545c1b2afc35e3a374a63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c130789b-b706-46db-bdf5-aa0ebb30167a/30251990505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f5dbd9-8ffc-4c99-a837-a1d00764e3a6/ropuvi.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_6ee96148549b4612b4e7adb0c06e73b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adbb6a2-484a-4c69-ad16-cf31b2254d60/88163764314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf87f59-e9d5-4657-9835-588929420a7e/jeporalitaru.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 5400 bytes
SHA-256: 45e9d2e08a76441db48ea14beaf48bd923ff4ab917f9fb903e08d52fc82977f7