Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf62d9f2d240cbee…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 07:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef561bdb18205b3f5b915c0326e288c4 SHA-1: cc1d23e8780b54050c16fc6f4970e626c21314e8 SHA-256: bf62d9f2d240cbeee299174b52f847d85e5e492a614bb3eec5952fe2354f1eaf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection attempt. ClamAV detection and ML classification further support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://ekorob.pl/userfiles/file/74612134652.pdf In PDF document text
    • http://commandhousecreations.com/uploads/files/15651487887.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zexetamuvamuraxijovoki.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/difidupupo.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/nasijexedipuwo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa27e9e4c1---96455559365.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/43973757801.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/57046055847.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/zitomofonejapuvagedeg.pdfIn PDF document text
    • https://badoza.net/userfiles/file/52779658592.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/99148084981.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-15/20210915224836926386.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/tujakozuvuxewobijabo.pdfIn PDF document text
    • https://aaaxxion.info/images/file/71101430867.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210919100826.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/22895029563.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gowibovidugejudomip.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/sawasojosarupufaxited.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kapuxitigig.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/boben.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/9980871598.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210916_011758.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903205522.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/31211585915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rtl+live+stream+android+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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 17656 bytes
SHA-256: bf9d78cb6bce70a8bdb2d0c34240cf06dee0050fc8d5c1568fd540fda32ca9ce
font_01_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 10664 bytes
SHA-256: 11ab7a8f562c0cc98be11d771828c0509b733f64bb8db6e10ddf8dd16513bcc1