Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bacc886d9dfb74…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 15:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba558dff3d362377c34806884ac767c5 SHA-1: 816fee9c7c6c24e3a6ad70d064b9cd1bed44a184 SHA-256: a9bacc886d9dfb745eb6cd801c2193b16699161c668b1159a3a2c105619ee68c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable domains and are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://temple.mo/userfiles/file/77513293083.pdf In PDF document text
    • http://ownlines.com/upfiles/file/wamiwedasafowizimezor.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/bunasu.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/degenufazavomulunevax.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/63972416218.pdfIn PDF document text
    • http://headrepublic.pl/images/files/7657208803.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/21946901017.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gixaruw.pdfIn PDF document text
    • https://ratodua.com/contents/files/sixur.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/xupeboxirogidejux.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/vibekusexibopo.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/30562139484.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xevezesuxaj.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/48738961593.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27b8c732d---rudakolemowi.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/xodologazafuximo.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/ditobipidabowuje.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/ponabavibasarokarubewap.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/83190880486.pdfIn PDF document text
    • http://gr-chem.com/upload/files/80122875050.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/56550056273.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///wodotirobalufedi.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/wurakepumizafuzo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362b496ae77---setipavoxilexefeseda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+address+book+appPDF 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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 17336 bytes
SHA-256: 95319da4c18573b941f2741359912da77e14b8ff85a6b2f9180471a7aff2c766
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10456 bytes
SHA-256: 9706ede117278d58f07533888a7e0ecb89944a983bae3fcf72cbe26689967c5a