Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62f61150263ee04…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 17:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b112c1b5662724084ef150848e92cc6 SHA-1: 4343c8b288ea11ca38c3612f7fb63b8d461ad651 SHA-256: a62f61150263ee044ed94b6982e04def15206634c192ff17337805e28ab7990d
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a visual download button further supports a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=crack+movie+download PDF link annotation
    • http://maytinhnangdong.com/files/uploads/editor/files/fexejadusapajokadalodozok.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210908_435C71F6F95979AF.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/6080196304.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/2976963118.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/57883442393.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/87834929323.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/75976897794.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210919_7F11E03E3C5B6EBB.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/xadatuvuvoz.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/96744833653.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467463c14b0---loxuwufu.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/57470736565.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/dakifofuginalo.pdfIn PDF document text
    • http://hidropro.hu/upload/15094804426.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/14699401329.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/rezevutevefu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/rawuguxedakeku.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/81136064639.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df67b350f1---16456511040.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/gewipitojagexegulovemugi.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/boxunaganutimuxinepanuxig.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10540 bytes
SHA-256: ed53acf27719461a9701c48357afb2cec67cad90352a26f26342d80d1c5d78f1
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 18676 bytes
SHA-256: 39c5213a68ee24067704b40a2905d5cc370da71c2c46e60ecdcb2e8643de17ba
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1