Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d57978d6312c5d8…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 14:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 82549e2eb052444b416b4af4417392db SHA-1: 5eb74733d2a75a4e57bd868700758b9a9df06b12 SHA-256: 8d57978d6312c5d8ef17d3e2292f2183516ce681aec7edb57201f658f67f4df5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://a-xian-coat.com/uploads/files/202109011710322253.pdf In PDF document text
    • https://073741256.com/uploads/files/202109021722452659.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/vozajodujo.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/23060382337.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/50304912268.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/vosemurowut.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/67391947123.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/goxijodafibinojapewuludo.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/16304389199.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nolanelexurigix.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/93801385928.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/lukefexosuwazokovi.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/43050034357.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/disagaduz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432aab7bbdf---sixanodasavunade.pdfIn PDF document text
    • http://upakuika.com/img/file/pulisinokis.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pimomamigatogesogi.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/23568202633.pdfIn PDF document text
    • http://metapolar.hu/tmp/84676163888.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fotomozafikuzanumutasabi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/81654194030.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/22804474026.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/178488437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+phone+is+more+popular+iphone+or+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 18216 bytes
SHA-256: 1cf3f8ff13718ef0345479e0c62a555f35f1e4a7dbe5eeb8a00b68c206834884
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 10748 bytes
SHA-256: 8d33161480f8da6973fb0cf88fbe4bc8af2e9c2bc71bfedfb446022b9778292e

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