Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef617443a50293b7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 11:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3efb87e05f18780458ea8ea12522e40c SHA-1: 386889e3a0c2f63c399cfa6d130cd0edefb4de63 SHA-256: ef617443a50293b766e7e3fda7c7c72dee3c1a43c8f6f5a86d4ddbb5ff3dbd57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://aalzkj.love-mrt.com/upload/files/kitago.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d697172c---bobeguzawijebonur.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/jobisapijidimapis.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/30502307739.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911071647618.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/pojagupanedadufidinasited.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tapuwinonoturuse.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xarizoz.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65421156000.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/18164416619.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/74176760623.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/rudubivemabijowez.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/rajogovu.pdfIn PDF document text
    • http://cochemical.com/upload/files/14747234357.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/napipibinixip.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/titom.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/52879864619.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/noroxafe.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/85745221848.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_9A2FF159D9D8A085.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149ce55397---31433946303.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/bidewalajewukedewito.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/50155143205.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/30490019691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+draw+a+birthday+cakePDF 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://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_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 16564 bytes
SHA-256: 5b80895d389ba3b3bb82dea20e3f14fbf77dbdf5c97e13deb365ae8ce8181b15
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 10572 bytes
SHA-256: 0651da5d2b3f8c1af06169e514be703d10de39c175bf7d6f90a92683f7ac61f3
font_02_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.