Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc08bf749107a7e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 07:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f42371827bc3f0c7e66c3d33b1079648 SHA-1: 4b5bb5263f0fe391d7ae4e7bf3bd7ed5f1920e88 SHA-256: 8cc08bf749107a7e9ca4aecd8a26dd010c4069f97094adee14357d49c21e6aa7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=backstab+hd+apk+download PDF link annotation
    • http://dancephoto.ru/userfiles/files/13406041992.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ddb41104fb7872ef2002b9cca79c74f5/wexawurisuk.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zisevugudoluxus.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/99299022683.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/zomemifax.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xokojo.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/solopaponedular.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/fupidazuginifax.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/42014029047.pdfIn PDF document text
    • http://cocoal.com/uploads/file/zitifegafotimawasalizev.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/gofenofirivupuduzujepuni.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/tokufifedobezubibubuk.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/bafuzap.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vubokukofukaxunadonerimul.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/gadevegonubam.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/44840479077.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/96885611466.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/76118472026.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/58237149589.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/36658519054.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161494e144aa7f---52283940992.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/27505928308.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://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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 10660 bytes
SHA-256: 9c8c3c6b22ffa4b865aac3a47ec7d713f765777e1ff9dd8eba4372f7bcef2a63
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 18328 bytes
SHA-256: 1ce8f45f00cb3eecead31bba773a1b31d050b425ddb44db44512a6ffa29fdca3

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