Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeeadc7593813417…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 15:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0225fa3e995309af3ee7ad92418d6a91 SHA-1: b05baac8581e8d6798603bae36c2cc41ac871d17 SHA-256: aeeadc75938134172dd0ea6947136e382711d231a7b0f13e70be61280b69945a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=bach+prelude+no+2+sheet+music PDF link annotation
    • https://hsiaoying.com/userfiles/file/12164423674.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/19241375921.pdfIn PDF document text
    • https://topupdana.com/contents/files/67987530351.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/99250797990.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4fb1594c---bawow.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/kigilipewevu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jajafowup.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/lurubutebulovekimep.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109040936212940.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/gemotuvupokunel.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bde4a9371e---49434442204.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/mapewurasu.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/67509709246.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/93066746373.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/1377068120.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63102128162.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/vinilunobe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/memuwinokuxegoj.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/wujupuvumijivalubifapuvu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/sijujopaporezenewovo.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/minuxib.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/topaxufazuv.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigagewatanowewikeniz.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/34820760743.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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 11052 bytes
SHA-256: c0be08a5a91d9524bf2ca3941da00c9d92310600aa1f516284fb186ca119cf29
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 17600 bytes
SHA-256: ca5f3502382274d308953a0511d8a85adfe1bd90b66c6f1624046467412bbbc9