Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0ed7cefd20a2a9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 19:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f267cee78ef0a774faa0012d555e82e3 SHA-1: a8d74cd667dc6519293ec5fe36b8dc0cb2a87853 SHA-256: 2c0ed7cefd20a2a9c5bfa64f5c88dfb3b12554298af10142210df9d2e67c07a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high concentration of links on potentially disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cck-brno.cz/ckfinder/userfiles/files/dosevedabuvileriju.pdf In PDF document text
    • https://rotitelor.com/contents/files/82093570293.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/80690574796.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/86243459923.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/12484791252.pdfIn PDF document text
    • https://pecintajp.com/contents/files/80473821257.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/28194772585.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/viguv.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/danexoborumoz.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/buzusezipitibusesaje.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/39870574405.pdfIn PDF document text
    • http://atya.eu/files/file/71524039443.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/94953944115.pdfIn PDF document text
    • http://nfc.soo.jp/file/56572040816.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/94029248496.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210908183156.pdfIn PDF document text
    • http://kco.su/userfiles/file/73041974967.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/metuketawuguvez.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/tudugidoxisuteluwamorof.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/50722759015.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/luguru.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/50328567183.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/kiwelevatiwivagul.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cac25137b---67251031886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=app+keeps+closing+android+studioPDF 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 10864 bytes
SHA-256: 75e6cb6bd8d12a9e14b131f4e9914f697825813dce8d07a5b08a3f0d8c6ddf8e
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 17188 bytes
SHA-256: a98c671aaa862ac51c90e158c25c33c5371b2cb7e4b39688d6c21dfa7878a298

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