Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b0788b8d9ac737…

MALICIOUS

PDF

72.7 KB Created: 2021-04-12 03:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5e1076962edfa2e3db7b186e9a15e73a SHA-1: 24a395b72709d6860d1b5615449506d472c3bf9a SHA-256: b9b0788b8d9ac737e083e6b1971d19d12b1544633069e9bd26088fb866cb0661
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and is flagged as a redirector link to known malicious infrastructure. The document body, though partially obfuscated, suggests a lure related to educational materials. The presence of numerous links to disposable domains and redirectors indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=first+grade+phonics+worksheets+pdf In PDF document text
    • http://lojapidabud.mypressonline.com/war_room_book_author.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/dog_vaccination_card.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/86598767444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_604195b2a6ad9.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/22892118020.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/xerujuged.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5ffd7c877e586.pdfIn PDF document text
    • http://tells.fun/84205215761x01ps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_600d148d90b77.pdfIn PDF document text
    • http://maddot.space/fojetuvimusogaggphoc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_e802d4245a07402daeedc1cd05e84d58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/sahih_bukhari_hadith_arabic.pdfIn PDF document text
    • https://ea29520f-fefa-4c12-ab21-0e0839e82572.filesusr.com/ugd/5d2047_2e29e432379c4941b5fe0f02d92867f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/ncert_mathematics_book_grade_7.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/wawurow.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/essay_outline_graphic_organizer.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_b57dbc3f913745c28da609e71ca61ce3.pdf?index=trueIn 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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 5496 bytes
SHA-256: 664675a3defcfb408fb6284ff68f4ffa5024b00eec553ea1cccfb39123635181
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10680 bytes
SHA-256: 4a3cef6335f9a0c7c19accd84cdabcff59d818ec75ca0b60df43dfd1cee25069

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