Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c7520340362e37…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 15:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6cc9b1538c017c2f5551eb747d22b16 SHA-1: 2cbafd049198963c2e1c44a407ca1e716a51d6f9 SHA-256: 48c7520340362e37d919d16e76eab9af905d10dddc3f2711c922e2cafee9601f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and a heuristic firing for a 'download button' lure, indicating an attempt to trick the user into downloading further content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+can+i+compress+a+video+on+my+android PDF link annotation
    • http://azco.friend-match.com/upload/files/mitesasutukowa.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/kuwof.pdfIn PDF document text
    • https://nyig.com/files/file/pokavotesadisuvo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/fekanugonis.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/44171405148.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/6852968350.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/3046944135.pdfIn PDF document text
    • http://unseretochter.ch/images/file/28433949794.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/72114376909.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/sepekimedafuluwipoga.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/54642070668.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/66040909196.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/popuvuj.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/3009102563.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c69b206e4---lilubufufutaf.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/55873363596.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f43b30acc2---18940310555.pdfPDF link annotation
    • http://stavebnevyrobky.sk/www/upload/files/41300488022.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/20499151161.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/timitupe.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/lojovitobevodudepebob.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/jafojutasakato.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/49874376651.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140290672694---66046002292.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_off0000b725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB725 16052 bytes
SHA-256: 7e25c734060d915c774628bcf888be29f6a8db6e69dcb5b18eaca27bec03ecd4
font_01_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 10788 bytes
SHA-256: 78826fe713badc10cb12b506d1bbf04bb05b8cdfffd84f315cc99951f03d77d1