Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb06592bf4dc6e8…

MALICIOUS

PDF

72.3 KB Created: 2021-10-08 11:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 94fd54d567e595523eadb138376de474 SHA-1: de652e6a8626aadd787a42e10d751c4be325f66a SHA-256: 6cb06592bf4dc6e88d86c3a75050a41bb971ec132104a30ccfe00f2400a10cba
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The file's structure and the presence of many distinct hosts suggest it is designed to redirect users to potentially harmful content.

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 https://chcial.ru/uplcv?utm_term=lactose+is+made+of+what+two+monosaccharides PDF link annotation
    • http://peneleos.pl/userfiles/file/20995147788.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/kimelufapojiwikomeko.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/vovegezujugepedifib.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/jenejumebifo.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/finik.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/vojiga.pdfIn PDF document text
    • http://anninh247.info/upload/files/nulojexudenafen.pdfIn PDF document text
    • http://c-amc.com/upload/files/fixojidonipe.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/54376373692.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100824188787.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/88601742028.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/nokudusanadepasij.pdfIn PDF document text
    • https://nasikampung.info/contents/files/44590171185.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/97444770900.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/92907509850.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615fcecf83b72---5396878438.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/9052396869.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/bavefesumodawiwarot.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/zenitemadawuxejuweroreki.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///17502603458.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/95110332534.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/neteginatekelefif.pdfIn PDF document text
    • 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_off0000bc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC59 15584 bytes
SHA-256: 969981b62596d6e25ef22378a4c624671d7cc5b79aa0ba9c300b5c97a172946e
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 10736 bytes
SHA-256: 6925aaab3d45982b6a5631cea478514f0e6a921debf9634ef2212792bde33e67
font_02_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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