Malicious PDF — malware analysis report

Static analysis result for SHA-256 575b87f467227d45…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 22:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 98b2075269ea1b2476f41830860d23d7 SHA-1: 10ef5c62fd15da4ca2343a7b43275c8d0021c568 SHA-256: 575b87f467227d451006fda663aa3583971e4de9dcd4d6a29419b4a372b92488
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://crophysi.ru/strik?utm_term=the+idiot+elif+batuman+plot PDF link annotation
    • https://cdn.sqhk.co/vixemujomu/X1dhihd/74494867251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_6030de0fa8cfd.pdfIn PDF document text
    • http://segway-wheelchair.ru/pokemon_dark_rising_2_gba_walkthroughmhc0n.pdfIn PDF document text
    • http://b2b-servis.ru/adobe_photoshop_cs5_crack_free_download_for_windows_7_32_bitgn1if.pdfIn PDF document text
    • http://smartline58.ru/suddenlink_tv_guide_victoria_texasa27wp.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/fWhjchf/santa_run_3_unblocked_games.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/adsoro_quimica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_603e78c7d5df3.pdfIn PDF document text
    • http://telemprom.xyz/marcelo_gullo_la_insubordinacion_fundante67150.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/2yjiifG/86960912586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_6026515bd7d4d.pdfIn PDF document text
    • http://akmurzina.com/cazadores_de_sombras_ciudad_de_las_almas_perdidas_resumen06pih.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/3lifOXc/best_birthday_cake_design_for_mom.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/53210905939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6027bd58e25cf.pdfIn PDF document text
    • https://cdn.sqhk.co/gepibilis/fjhifoB/organic_chemistry_acid_base_extraction_lab_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namakanexir.atwebpages.com/65509883112.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/becoming_supernatural_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/city_of_bones_graphic_novel_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/69514489763.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_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 5096 bytes
SHA-256: 68f3a01f347a858b927fb07f2605748662c0e0d522c84c9157a3a34110b2489a
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 11724 bytes
SHA-256: 01875671fb02ef775eaa5beecb86f0a6311e1743ba7aa2e1174c488c99730be1

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