Malicious PDF — malware analysis report

Static analysis result for SHA-256 36672baf91d4a543…

MALICIOUS

PDF

87.0 KB Created: 2021-10-07 08:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fec32b2dc96ad319e6d1045f0db51d4 SHA-1: 6742f44c45e8df2f274feec0206f73bcb5043b1a SHA-256: 36672baf91d4a543a54f486530fb972e4b501ee6afeb9dbea84c9d5de444f329
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The primary purpose appears to be directing users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://przychodnia-felinskiego.pl/uploads/editor/file/lejajuropo.pdf In PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/zugidoje.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/70464224434.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/5eb255480af5614f4225be538df6c190/83680283343.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/reguduvalitudago.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/kulujisoxumopugezakugugap.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/90972822747.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/91578250153.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/91685922269.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/65588661361.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/fobeludofegevu.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/novulove.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/77701654586.pdfIn PDF document text
    • http://devveb.net/userfiles/file/padibezed.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/botem.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/malajagapab.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/63627394646.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/371242295.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/72307827430.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bisebuvobisodivelu.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17200838373.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/45622973780.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/mejavatew.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/zogepudanewofujalomeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=calling+someone+a+pillPDF 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_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10428 bytes
SHA-256: d605970d06836a0fc00e0e74e810b61ca047744aea34f7db1e3841781f4fdad0
font_02_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 21620 bytes
SHA-256: b03b54b08a1be6b2f90e4811f2b8b9be3d43f3071c398aee7cc3b8e54f14ffe0