Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8659532e771309d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 06:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8dc7bbb765bfaae22ed1f0ad67f0f3f SHA-1: 92d931570d9b0bca4c16159f6b34035be08e587d SHA-256: a8659532e771309d2f4d7c9ac65195fbd97abe4342f25d252bee711792f31cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b43f94f373c6955b3ac94cebd4757370/60192983402.pdf In PDF document text
    • http://baohanhranghm.com/upload/img/files/54848271550.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/10622030810.pdfIn PDF document text
    • http://baove24h.org/upload/files/83113087040.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/51507216620.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/laletinopogu.pdfIn PDF document text
    • https://projetovm.com/uploads/files/87712531748.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/mibatifaxobezus.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/31016166825.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fijiwonaterafi.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/3383731923.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/64238847132.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/xadupejikuleboxapato.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/taxef.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-24/20210924131235863175.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/sokom.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/92686282302.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/katorolev.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/zovabejese.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/pojisup.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/26443798772.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/55535513031.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c22ba9846---wofivo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50521457422.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/64355621811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cara+install+dual+boot+ubuntuPDF 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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 17192 bytes
SHA-256: c787e4de2233f78831ebe1d5c2e48b1194d54bd0275ff7f8a9a989505a9ab4f7
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10380 bytes
SHA-256: f47d030aafbaaeee6f39af3a25a310cb57cf2be38698d3574dc25356bc494e94