Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8cc64abe8432d2…

MALICIOUS

PDF

70.3 KB Created: 2021-10-12 00:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77b2135c7baebeae5847fbe02aa51278 SHA-1: 6ff70b3127abb66f99f0f9e596e820278b96b5fe SHA-256: cc8cc64abe8432d2478b25aabf14645fbed2f191324f33f0bb36394ff5d11438
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to its use in exploiting PDF vulnerabilities or for obfuscated redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=500+word+essay+structure PDF link annotation
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/debezuvesonix.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/21647591035.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/juwokolo.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/15602288914.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/bipobagopurijiposenodo.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/wejumegurilowunataworasis.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/61011063109.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/88011332873.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/31029952366.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/23727979811.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/zuxusuvuropitobiwewalizum.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/76161129692.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a18f0f969---wizigugosak.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mopadoxepu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/58316175223.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/62042437585.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/93171074397.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20211007_042959.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/tezirurotibow.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/5410240240.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/selogakukipufov.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/36234723200.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021961847578192.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 15028 bytes
SHA-256: 3d899827d618e4edf779a8ad4ebddce4d20814a609aa217cd8f6ec3e9dc9a043
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 10580 bytes
SHA-256: d38adf8662be89c07183576886493442574a3109e76b8c47f520510eddb466b7
font_02_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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