Malicious PDF — malware analysis report

Static analysis result for SHA-256 242f418af88fc578…

MALICIOUS

PDF

87.2 KB Created: 2021-03-12 22:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a334f3cfadfb4c722f4f859eacaa5ac8 SHA-1: 7faeb8f884a27775d95a4a50dab497f2800cbf8c SHA-256: 242f418af88fc5784734bf7958e61f0adef236372c83fea66c0564cbf06d451a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results for popular content like movies. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, and the 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=black+hawk+down+full+movie+download+fzmovies
    • https://cdn.sqhk.co/xewumoxu/chcjghg/austria_bundesliga_top_scorer_2019_20.pdf
    • https://cdn.sqhk.co/mivezifov/hegi2bj/38174290975.pdf
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/fabolinufasikat.pdf
    • https://cdn-cms.f-static.net/uploads/4500187/normal_6022321d9c7f4.pdf
    • https://cdn.sqhk.co/zopimoforaja/ijeA519/best_country_music_songs_2020.pdf
    • https://cdn.sqhk.co/bidamasegom/luicheZ/nomad_sculpt_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5ffbeab84a818.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_604a8684a4fb5.pdf
    • https://disepijov.weebly.com/uploads/1/3/1/4/131438002/viwita_xevubufonuru.pdf
    • https://cdn-cms.f-static.net/uploads/4450426/normal_602d2e7729962.pdf
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/muwavulal.pdf
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/72a0ab2.pdf
    • https://cdn-cms.f-static.net/uploads/4416671/normal_5fd191c276dba.pdf
    • https://cdn.sqhk.co/notizejamebo/hfLhajh/63123366845.pdf
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fe2f19f3482f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_15ed16e165ff479092568c94824e0987.pdf?index=true
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_4342c0e052504dafb6fe2cb5b2066935.pdf?index=true
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_4ecfe9ea71db431dbf7601e37c111616.pdf?index=true
    • https://uploads.strikinglycdn.com/files/217bacf9-feb3-48d8-a813-2c5fac6eeb72/clasificacion_de_numeros_irracionales_y_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/c337e9a4-6b2b-422c-958c-5d349b051d52/taurus_800_series_45.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_8b63a883074d49b9b81a03b5ee018f80.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118ec.bin
647c47c31c3124e968e45e58c0e4a989ab274cca8b33eaa6c4ba8b8dbd3ca116
pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 5480 bytes
font_01_sfnt_off00012b9c.bin
9898929d9f9e61b4c46ef5353e3e62945435e969afe1338a25b1cc22e13c250a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 10544 bytes