Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c85c5367fdbbfb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 12:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49df36469852d5f498ddaabc19ceaa4d SHA-1: 24d9fbb43bde9873868b307fa8258aaf197323e7 SHA-256: 08c85c5367fdbbfb96081e7fd0306c02ad896bc5716feb183ab53eb207377e8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, aiming to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://krisoc.ru/uplcv?utm_term=3d+live+wallpapers+download+windows+10 PDF link annotation
    • http://miass.realxenon.ru/uploads/files/segir.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kapetifigudaxifuka.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/46607737158.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/wunolabug.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/91594382897.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/46596019480.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/muloborokubeko.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jojaselukilekonevawaf.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44ea0d600---betewamudalub.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/julonosezemuregitivu.pdfIn PDF document text
    • http://i-physiology.ru/upload/36467325769.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/40728430177.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/libefukowosufurutoga.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/83545005825.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/67306398.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0b1e45bdad193341391766179d81b196/60534652211.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/97808851511.pdfIn PDF document text
    • https://bagstyle.uz/images/file/tosapinewenadab.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/43301904413.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fugidomapev.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/44674209823.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/79206486673.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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 16544 bytes
SHA-256: 3596f62d249960767f485e1c22bee690f11e9637b85a3b788a8558af99bb3aa5
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10688 bytes
SHA-256: 6757363aaf88e62586e46598217db12f250e9740d57aa062b80b270a19f60a24
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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