Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4137eb3c371388…

MALICIOUS

PDF

76.1 KB Created: 2021-06-06 03:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e50a65decb934901efa2f5e0445d5f21 SHA-1: 0a55a851fc9ea85b7096d7ddea7df6f0a559f30e SHA-256: 9a4137eb3c371388231883b08a5aaf4c0235ba015b766d3ecd3db6d20440c919
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of obfuscated document body text and the nature of the heuristics point towards a phishing or redirection attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://irlanc.ru/pbw?utm_term=how+to+write+a+commission+agreement PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/730e5ee3-5581-4556-9d66-b4c46a89ea7b/what_age_is_26_chest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e5fbf0-a840-4b75-916c-3b384bb86803/60661426571.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/86416639083.pdfIn PDF document text
    • http://garigor.pbworks.com/f/how_to_use_hot_shots_stiction_eliminator.pdfIn PDF document text
    • http://fukibaso.pbworks.com/w/file/fetch/144692907/how_to_pass_business_studies_grade_12.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/american_beauty_full_movie_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecdefc8-158d-4f0c-a6d3-bd09e6c7b348/xajonetedi.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144490542/fotipu.pdfIn PDF document text
    • http://motekus.pbworks.com/w/file/fetch/144692724/hotel_jagjeet_mirik_india.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/download_fashion_story_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fc64c7-9095-4031-94d5-e556e3bac479/jidubuwuvomikikodogipezat.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/71387157283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1531fc12-8266-4aaa-b5b9-65e33c8a0043/wamigomapakosu.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/99608517107.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144532020/blues_scale_bass_clef.pdfIn PDF document text
    • http://mosijiv.pbworks.com/w/file/fetch/144424020/gewap.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/w/file/fetch/144674352/gepatopubova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9193480b-93b3-4895-97ac-1267912e6c98/gepibedasir.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/w/file/fetch/144553104/59743418739.pdfIn PDF document text
    • http://dufogeruzipu.pbworks.com/w/file/fetch/144693042/berliner_platz_1_neu_cd_zum_lehrbuchteil_free_download.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144483897/dalurire.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144480234/cessna_310r_cost.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_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 5140 bytes
SHA-256: f8c032a4236d9718caffd8e87af4772c707c604361e241c82abb8f8ceb4ef3d5
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 10172 bytes
SHA-256: 0dfb1276b073f2bf3d3786fd6276d13bc0fd4fee663c3071cd1c033390235d55

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