Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a06260dc13a4cd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 04:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f66a664081d0bd1e0e882f0311536d9f SHA-1: c51a803f851e2631bec28d8d98fd1f6afb529948 SHA-256: 63a06260dc13a4cd3fa2d65a7e78f0208c54f1e2fe5248bea097e48eed8b9953
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to trick users into downloading further malware. The ML classifier and ClamAV detection strongly support this assessment, flagging the file as malicious and a potential phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://xn--q20b13r9leepaeb.net/upload/file/202109110156449575.pdf In PDF document text
    • http://smenergy.kr/uploaded/file/166914169261353f9675ae7.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///femasojasivixasopo.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/45939862153.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/78976335196.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/mapudiloresegavojerukum.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/69783034834.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/88806723759.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161355ba40dddc---kusaduzovajisakuvapo.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/lepadusijawutokagojavilil.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/77097891137.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139057434286---7872104260.pdfIn PDF document text
    • https://arendic.cl/files/41574777001.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/63347043828.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/zutuxiwawekerin.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/50866009174.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/wameronijomeneto.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vudozapixubusasadogejokez.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/73928775317.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/22512789006.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/3617985741.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613c05af37308.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210904080440.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/34455274048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=xvideoservicethief+apk+free+downloadPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 10968 bytes
SHA-256: 452ce9187714a8de6f42dd7fcdf4d4431126a9ed7c9b22a4856deb9440368b71
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 21368 bytes
SHA-256: 52eb3cd9e3139742409dc99d613d2abc3a252594466b9b000bb70ad9c615af99