Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b404afd45ffe0cb…

MALICIOUS

PDF

118.2 KB Created: 2021-05-08 14:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34a066cc92f279fc668828cfd721dfab SHA-1: b0344317839b23897e72e47eef87ac56bac8bf4f SHA-256: 1b404afd45ffe0cb68b71b3f665fbbd3b53cc272c1b298a5595c5668206809ae
126 Risk Score

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 0.9997

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://zajinet.ru/strik?utm_term=q+significa+una+linea+negra+en+la+u%25C3%25B1a PDF link annotation
    • https://cdn.sqhk.co/kisasizaro/jd2thjC/66268377970.pdfIn PDF document text
    • https://cdn.sqhk.co/pekuwalixeso/nyifjgz/25459747010.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/iiaw9jb/instagram_logo_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/chfihou/silver_band_apple_watch_series_3.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/KijEjaT/tigosuwivomozodaju.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/zMiguge/vikose.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/gegf0ww/pinata_smash_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/gj8hjuc/4k_landscape_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonimegalidoxu.epizy.com/apbn_2016.pdfIn PDF document text
    • http://vatujub.rf.gd/diferencia_metal_gear_solid_2_substance_vs_sons_of_liberty_download.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/jamejuxudu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/togutozibuwudixawowejawuf.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/gitalesibisilobeliwirik.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/zenaxoligekusa.pdfIn PDF document text
    • http://vogokobujapipam.epizy.com/aprendizaje_cooperativo_en_el_aula.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/emiway_bantai_jump_kar_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/dajewavivaga.pdfIn PDF document text
    • http://xovabegu.epizy.com/pokux.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/gubosowidasemowuweted.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/39412155458.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_off00018f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F42 5324 bytes
SHA-256: 9167b78779f7256f034fc4bb2ebb3d260fd10dba0caa5d11d50cf01b2f808635
font_01_sfnt_off0001a135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A135 12164 bytes
SHA-256: 1ee07dc1b6c3149d16d117dcf9546a0b1811c776cb2fa2b36a8ddc95581f4ebf