Malicious PDF — malware analysis report

Static analysis result for SHA-256 18130a4200f1b949…

MALICIOUS

PDF

77.6 KB Created: 2021-02-27 23:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc1c66ea005d8ad76acd6f14b9e91873 SHA-1: 2fabab97145483a9249f2991621bcdd7f0be047d SHA-256: 18130a4200f1b9493ed403dfbecab31f0920db3d9beff3056e945556f305aaa7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

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/award?keyword=how+to+make+a+flamethrower+in+minecraft+pe PDF link annotation
    • http://bibopasaxuvibu.mypressonline.com/why_do_germinating_seeds_respire_anaerobically.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/juegos_de_el_hombre_araa_en_moto.pdfIn PDF document text
    • http://cybety.xyz/242239257440av16.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_pair_photive_bluetooth_headphones.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/casio_privia_px-870_reviews.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/1st_90_days_summary.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/7th_grade_literary_terms_crossword_puzzle_2_answer_key.pdfIn PDF document text
    • http://albl.ru/active_release_technique_near_me96f45.pdfIn PDF document text
    • http://delifeschool.com/37926380314xtohr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesapekaf.epizy.com/xizogu.pdfIn PDF document text
    • http://pagiwufuvefukuf.epizy.com/dupagixojelesugotakom.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/jedijinoxifijaxazajam.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/htc_m8_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/aayirathil_oruvan_songs_tamil.pdfIn PDF document text
    • http://kasisexa.rf.gd/skies_of_arcadia_legends_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/57548982375.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_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5196 bytes
SHA-256: ccedeb96c9633fef8f59d5d15f4b65487581094a255862575975b1dfb328b181
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 14820 bytes
SHA-256: 303132f0e120d6be10f60f19713b04437c776d627c7c33424ccb676fe127fb55

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