Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35404c67dd91041…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 12:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f47c4cca2779062fc8257a239976116 SHA-1: 07b1810771c5480a7efd813400561e207a476447 SHA-256: c35404c67dd91041e7a5e71cee468fd301130cfbe51d1d29bd3b0ee8c3d99517
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, with a high-confidence ML classification and ClamAV detection indicating malicious intent. The presence of a PDF_RANDOM_URL_LINK heuristic and PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is designed to redirect users to potentially malicious content, likely for further exploitation or phishing. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://csc0451.com/userfiles/file/20210919225004_jnwu7c.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/demirev.pdf
    • http://satisfytech.com/ck/upload/files/duzikunizuvakokak.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/21687403218.pdf
    • http://h-st.nl/bestanden/files/dopunelumuto.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/mexinasube.pdf
    • http://makrostal.pl/user_images/file/mesap.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/dofiwit.pdf
    • https://listapp.in/ci/userfiles/files/kurugipewifi.pdf
    • http://banglenhospital.com/UserFiles/File/3147363683.pdf
    • http://korsorlampang.net/user_img/files/judisazipupa.pdf
    • http://villapellegrino.it/userfiles/files/lenekerosot.pdf
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/79799931878.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1255044cb---vozurilaxadifapukin.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/27982991634.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/98122338530.pdf
    • https://incoyun.com/calisma2/files/uploads/zamux.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/415ea9384bb4fb4ca8d888f8afb5f996/dujavurol.pdf
    • http://ajisushionline.com/uploads/files/41608227409.pdf
    • http://tsutae-f.com/js/upload/files/40950979766.pdf
    • http://rent2day.ca/ci2/userfiles/files/filufemoturodi.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/gopojadajemowurogikirarez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=anthropology+of+language+ottenheimer+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b28f.bin
b77505a811d63789192126074153b04b133915c13977c3a63808e93940b84404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB28F 10972 bytes
font_01_sfnt_off0000cba6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 16792 bytes
font_02_sfnt_off0000e3b8.bin
71950baea7c23c3e03138cfa0f1a523002302b806ef606f19d1df651a7e22568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 17936 bytes

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