Malicious PDF — malware analysis report

Static analysis result for SHA-256 574623e1a1fd14da…

MALICIOUS

PDF

90.5 KB Created: 2021-04-18 16:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 54f64af2145417601e987937ddc565bf SHA-1: 2335316b37ccb74c2737fa2eae087c9588764fde SHA-256: 574623e1a1fd14dafe5d3bfc51d8fd2f8beb6abf6a5f69b974ea97135dc53af3
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating suspicious link behavior and redirection to external domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple suspicious links points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=should+contrast+be+higher+than+brightness PDF link annotation
    • https://cdn.sqhk.co/sasibasodiwu/hijOJwx/tablets_for_sale_amazon_calendar.pdfIn PDF document text
    • http://kawlites.online/despertando_a_tu_gigante_interior_resumeng00a5.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/cXlnicp/assistant_store_manager_jobs_san_antonio.pdfIn PDF document text
    • http://complerbnp.com/zexojoluju5prgz.pdfIn PDF document text
    • http://slmit.fun/doodle_mafia_answersws8r9.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/hcKQifi/uab_guidesafe_passport.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_60543a33297f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_606b92d30f2af.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/maze_runner_death_cure_cast_intervieweg0yb.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/gelubigaji.pdfIn PDF document text
    • http://wiwalubezit.22web.org/restrictive_cardiomyopathy_echo_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/rebosuvut/gKkec2d/ballet_litecoin_block_card.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495392/normal_5ffb7c481e050.pdfIn PDF document text
    • http://mivabeb.iblogger.org/dimensionality_reduction_in_data_mining.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemudizibumak.epizy.com/cabelas_dehydrator_owners_manual.pdfIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_2cca49f196fe47bbafad10a0af52ebe5.pdf?index=trueIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/mathematical_analysis_by_malik_and_arora_book.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_8d4c425d4fec4bada48d35ff7f0910a5.pdf?index=trueIn PDF document text
    • https://6d1a2d78-ebd2-4140-94a0-411197be5b5f.filesusr.com/ugd/88ff89_f931e8121a5e408ab9a9406e6c3c8a91.pdf?index=trueIn PDF document text
    • http://nudagimanefej.atwebpages.com/causes_of_lung_cancer.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_960d5c1ec3c142ffb191183b24abd402.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_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 5444 bytes
SHA-256: 1ca687a5a06bfce73527cae927781ec4477b60a9969a4c2e6a100c9c480574f5
font_01_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 11480 bytes
SHA-256: cca15c1e9a19519c32f78ac95676aaf6dc80b16abbd83af8c0956c77c7c7cb84