Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e97516a87cad52…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 21:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7b6b7dfc80e9a355481447e749254bb SHA-1: 0ae8d8dec2b98ee3263d0c615b130d9534c87bbb SHA-256: 79e97516a87cad52ddc74b5942304faafc1f687077fc80352f4478c49ad342d6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. No scripts were extracted from this sample, but the structure suggests it is designed to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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=animal+crossing+new+horizons+on+android PDF link annotation
    • https://prokoncept.hu/admin/blogfck/image/file/25036968307.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/gopivug.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109140155139002.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/39206940054.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/gekofuvoxogepiwawirujebo.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/64179530988.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/75327925105.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/96938628218.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/57069713737.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/75903276099.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78da38721---dekabebixaxipibodijida.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/35140314263.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/madetubutajuba.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70740444528.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/34057112474.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/98094635955.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/75880160507.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/kajuvugefikirerevef.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/suzizodizokekoxureda.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/28666863199.pdfIn PDF document text
    • https://izr.fr/files/loradudiwob.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/38561879443.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/nuwebubulub.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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 10848 bytes
SHA-256: c06ea9509b581297de34b095024f05020a67fff864cdeb0d527d6856cd416efa
font_02_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 15072 bytes
SHA-256: df09ad1ebb3867d9d0c398152a9b996baf9cecbc427e72426fd9e91a4677a71f