Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8178bcee61cce1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 12:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4d8273b2a27a75348e7611a89ede0923 SHA-1: 0a6667e027ca55b4e868dfb4fe97b682d183c84d SHA-256: 4b8178bcee61cce15815c6c4f05f9735301d7ffabd01977ee92fa7bb85a6ce92
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=inside+out+demi+moore+pdf+free PDF link annotation
    • http://lafilubepojev.scienceontheweb.net/autoestima_baja_y_alta.pdfIn PDF document text
    • https://cdn.sqhk.co/gabogivoxavi/fgeijeQ/989703699.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/zifaxilenajaliginak.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/zoxevivonifam_sasifokidijo.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/hgqigfB/barorijonimu.pdfIn PDF document text
    • https://tadudekum.weebly.com/uploads/1/3/5/3/135391719/gawefixagufovar_mugirugekape_vegepepubiki.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/50cfd84e44.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/ddeicjb/79264109110.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/verbos_regulares_e_irregulares_em_ingles_com_traduo_em_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/AP2vKhf/gufidoxipiviw.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/wings_of_fire_book_summary.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/how_to_setup_blackmagic_intensity_shuttle_thunderbolt.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/atualidades_para_concurso.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ief6FZ6/vewavovek.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/xukirizugukugi/tintern_abbey_poem_with_line_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/my_frigidaire_ice_maker_quit_working.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/41905809952.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/kolibufuvisejazoduxodonew.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/10892592222.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/divina_commedia_testo.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/fewipujakeju.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/tumum.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/gowijopeposasul.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/nezebudip.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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 4884 bytes
SHA-256: 23f5ec5615bfc4369d86176c04b1da725512ef1dc5ef05299db0cee84e58df40
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 11024 bytes
SHA-256: f5b40c997eb19c6d9f5c3e64e88e20945611147c86d6cf10144cb6e9701a8c80

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