Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1a579570199b69…

MALICIOUS

PDF

97.4 KB Created: 2021-09-19 13:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e01984258505926c8a38a18b20827ec SHA-1: 8913f061ecb5182f6b66431d74bb39bd045d6075 SHA-256: 2e1a579570199b697a9dfa0af48d60a1f81a633789dba6d50f040678a0bc8713
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://architettomontanino.eu/userfiles/files/dopofirivonotam.pdf In PDF document text
    • https://juraganmonyet.com/contents/files/ralenojivuf.pdfIn PDF document text
    • https://windsbs.biz/files/file/mosanakafanekaza.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/pajepubiluliw.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/fijolinalejijijuxinonen.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/dixusadosagimu.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/34253734708.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/41027144784.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/pogetelagazejorawedutekap.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rufezovovebitomiwe.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/1128072640.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/bilepugavuzuranakoverilor.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ba2f2de---10645575663.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210916_7A9BA83EA1EFA355.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/73430136822.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141337d10ee0---dogigiresujedademu.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/bikudusugagemiv.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/61237500690.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/82361472815.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/84251327942.pdfIn PDF document text
    • http://jawarakreasi.com/file/demidalesukokiruvirepis.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/60990596986.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fanubu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210918195843.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/panutigeregolejalen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+upload+pdf+file+to+server+in+androidPDF 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_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 10736 bytes
SHA-256: dfde5874d9db0bef0294a768b7e61632abd7c09f93d73d18c9dff8f7d916ad8a
font_01_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 18708 bytes
SHA-256: b6386035ebb3742ab1f7c5857a4403e877a103c75f4ec5b6f06ac0d2addcde1c