Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c8de7acfd0b885…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 18:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf0249ffbe2ab4385d2df49d191109ea SHA-1: 470b006d7b8a9dd6500f1763652c3d4f9547bdaa SHA-256: 80c8de7acfd0b885bd6f808cb5556c7d2027a4f22bcbde93ea40670b8917583a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to distinct domains, characteristic of a link farm. One heuristic specifically flags it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting its purpose is to redirect users through multiple sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://maha.tcnme.com/chop/multimedia/userfiles/file/rigezutawovereb.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614788748f67b---gegukomadujekorotokowebi.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/kojoga.pdfIn PDF document text
    • http://qwerty.pl/_data/file/37055791395.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/mazaxumolagusikol.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/joxejaxopenule.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/sofifiwigukixobib.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/podinarobulepukas.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/30539507375.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/70230290731.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/4284522326.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/94214642406.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/gijupuragalivowalokojum.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/kenikodez.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lujewasis.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904063708.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/55581711053.pdfIn PDF document text
    • https://cncunse.com/d/files/22978956409.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/11906756062.pdfIn PDF document text
    • http://congtyvima.com/images/Download/suvobaronapigagife.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/korabuweluvafo.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/fujuxuwemamosew.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/basowameraj.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/fofinuzewutugo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///zejuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dragon+ball+strongest+warrior+apk+modPDF 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_off0000b3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BC 11052 bytes
SHA-256: 759b232f66723d6addb744483027e857a25b33e9df6bdc8122dac1783fb72809
font_01_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 16044 bytes
SHA-256: 4225c4c1302be5d8d273d112e9fce8c663857035e7ccd84e414acbbd86f602f6
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1