Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd47aae737f7331…

MALICIOUS

PDF

78.6 KB Created: 2021-05-17 12:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d1e1bef295d1a6052399d0ed207a3a4 SHA-1: afd9c7678d515de48aec0df3529cbab06502133c SHA-256: dcd47aae737f73314f1e1d82650944ff36c65d9fd6eae52245f49f426891e2e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the presence of external URIs and the link farm heuristic suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=take+ivy+hayashida PDF link annotation
    • http://fegivate.medianewsonline.com/adobe_illustrator_cc_tutorials.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/54671463932.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/xggHe5S/wovilojeguw.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/shf151q/pet_shop_story_game.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/50485907248.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/hbAisig/26169783562.pdfIn PDF document text
    • http://banujal.iblogger.org/autodesk_pro_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wudajelu/ibVQhhg/sao_rising_steel_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/ghSBjhc/xesiruxanaxawixuwogezib.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/email_writing_exercises_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/taguxif/60571674507.pdfIn PDF document text
    • http://vikipabolukizi.rf.gd/how_much_are_private_dog_training_lessons.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/oxford_children_s_picture_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/stephen_king_rage_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/ferrari_458_price_history.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/givuwomape.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 4144 bytes
SHA-256: 603cce6c5ba2266f80bbb1d39886f9a3daf2569ed9b372a40f41ad8bc4ec7bf0
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 4960 bytes
SHA-256: 54961606d284285305147197d9e3d1468f146d94eca7d431c04091f316ddac63
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 11280 bytes
SHA-256: 3eb7d93cace6b1581832453c5636e0dc88240bc1e1d1de46b98116f488056b4b

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