Malicious PDF — malware analysis report

Static analysis result for SHA-256 f061b3a075d7bca0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-16 22:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d8afa921521e3fdde31ec587ea07e03 SHA-1: 5f44ece1d40b69b71bf87fd4caccc7130927bd81 SHA-256: f061b3a075d7bca0e276262a00c5d9ef2ad669e964dde03814fe0f983bd6d531
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 maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and acting as link farms, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=dragon+ball+z+heroes+all+episodes PDF link annotation
    • https://hophamthaibinh.com/upload/files/silakaj.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16137199957ae0---zowufajogugoz.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/vepuzulojuwi.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/vodesojuwinivevizileb.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/93138047331.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nunewepojugetome.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/gemeraviradafajorunutim.pdfIn PDF document text
    • http://yztools.com/images/upload/File/ruxaku.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/kedokufelamebudoto.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/90070113486.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee345496e6---14306593667.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/nakamutakuzajek.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tifuposutitaxusakokesa.pdfIn PDF document text
    • http://qdjshg.com/files/file/gemamufiwam.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/woperepagonejadijore.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/pisozobefo.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/10694869053.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/56340965938.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_off0000afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB9 15100 bytes
SHA-256: fc0ac3ed27f5ce8af2407dc5de3235e1b71ea5613d4059eff8feca54a97e9e10
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 10772 bytes
SHA-256: c2cf78d31a10389bb7d24136ddb404b51645655c537c69390d0132e57e9d4133

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