Malicious PDF — malware analysis report

Static analysis result for SHA-256 954a1dc4eb43ae08…

MALICIOUS

PDF

80.7 KB Created: 2021-10-08 16:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a4c5181ab7138c8c8d6094628536fb1e SHA-1: 9af802d997b1e249fc0493271f1352c7501e3ce4 SHA-256: 954a1dc4eb43ae080279ea5d0753c96fe99925b5465cbd746c58a0116636ea72
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many of which are part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=charles+stanley+daily+devotion+today PDF link annotation
    • http://parkety-patemal.sk/files/file/timanigixezedogeromopax.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92312906080.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210930095344.pdfIn PDF document text
    • https://latework.cz/soubory/55298419427.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/79574234010.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/41165782440.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/74313559164.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/9776634568.pdfIn PDF document text
    • http://cold.lt/userfiles/file/53861160979.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/71943924687.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/fuxobiwisijiroguzoge.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/xasavugawekuxojimu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1822aaa96---90071452074.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/poxenijatifelorokivedifir.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xebowil.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b5f0bfb33b0e55b5045a0d2ad7fca59e/buwimavabod.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/8948953496.pdfIn PDF document text
    • http://toonesk.com/upload/58835869135.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/wizejotamonowenanidalugak.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/lijita.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gipitapobipakugoloz.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/1827865239.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 10556 bytes
SHA-256: 30b5e0be08ac20afbe0fc6719ca5a16fb4b472717b46a19407b70a62b94ade26
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 19564 bytes
SHA-256: 9ec9f5ee16319bcb56b32abcffc805e29b61677de05b9a79d050e8380fb531a6