Malicious PDF — malware analysis report

Static analysis result for SHA-256 998e1c5465b8a08c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 02:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93b61ed9b3259fcacaa11d6c8fb94537 SHA-1: b3e599c4c3cd00d604da29485a4ff7c83d00d6ff SHA-256: 998e1c5465b8a08ccb20411700c03c98f3a36612bc81df56cd6f855b59b0ef4b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URIs, many of which point to disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=android+mobile+application+thesis PDF link annotation
    • http://kbautotech.com/board/datafiles/imagefile/kuxinimita.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/55891478998.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/30916570649.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/jopuf.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/molasib.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/lokowanudunitiw.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/52673939616.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/bunipukugesuwabivokax.pdfIn PDF document text
    • http://ministerium.pt/files/22029726774.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/83594697837.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/vulimatewe.pdfPDF link annotation
    • http://willajarmar.pl/userfiles/file/nekobi.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/68213480770.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109160604064644.pdfIn PDF document text
    • http://vuason.vn/upload/files/viras.pdfIn PDF document text
    • http://tochuchoinghi.org/files/sejagifufelejezo.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/57876454550.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/53594357284.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/65882851351.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51417277---21883469656.pdfIn PDF document text
    • http://lulanjina.net/upload/files/sezenububobaxesog.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/fojoratal.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/70562901355.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-18/20210918135440122097.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4rll660d6ph1e7a5a82bi3r1g5/57274014764.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_off0000c76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76C 16508 bytes
SHA-256: 57114db865ce97dfb1389a0ce74f8757077fd3cca811206d7344bc18ff51d7fc
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10900 bytes
SHA-256: f5af71201d4db5cab1fa892a68254b3202df1060290f47c87e528d3f0189b64a