Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0a9c58e1ecd2ce…

MALICIOUS

PDF

86.8 KB Created: 2021-09-14 07:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e7bad863e742f4e8bc3da91fde83c0ac SHA-1: a257d0e67191aa83b8fd484d39ca3c05fe284e66 SHA-256: 6b0a9c58e1ecd2cefd86b33a8692539012aa1d9ee7b191ac10db89a6947d9403
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of links, many pointing to unknown PDF files on disposable domains, indicating a link farm or distribution mechanism. The presence of external URIs and the overall structure suggest it's intended to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://hyosangjo.com/userfiles/file/20210903091153.pdf In PDF document text
    • http://harekatmemuru.com/images/Media/files/xabipixuvasaf.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/kimemugip.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/bedodojasedenaferulejomil.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/sipob.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/mariwutiviwabufepekukabeb.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/vixoxefesagevom.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/xikikaximajopuk.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ae926d184a2c32f458bd073e764dc7bd/xilafesi.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rulebusumezoraxidogu.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/60631277615.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/vemeget.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/31016281625.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/57238404845.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/wubowuwujeponevagejiji.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/67471217996.pdfIn PDF document text
    • http://gardatrans.com/content/Files/fadapesariteka.pdfIn PDF document text
    • http://juentai.com/userfiles/files/82626291936.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/ridep.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/313f70df751447885e116ba4ebc8d837/45722382775.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/5249436948.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/jimuwikosibuwaredino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=25th+largest+country+in+the+worldPDF 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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 11108 bytes
SHA-256: 5a664ccdbeb6cdb8e83ee1343d2b3b1f565590d441e72312f20847d605edec8c
font_01_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 18456 bytes
SHA-256: 8f6a17b8e922117a69f45be4239cab39f6eb7504649d86c843442902fec7ba65
font_02_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1