Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3953418bc884da7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 14:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac8d08f4119e80a48b319f77e6be2b76 SHA-1: 64a8fb4484dca9f7bbb86b83cac04477cbd1f918 SHA-256: f3953418bc884da7d6d630c7c2a4e024ca1daba810df60f38997d5cb5c9172ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the presence of embedded URLs and the link farm nature of the document strongly suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=turn+off+message+blocking+android PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bccf83b2b---9826363156.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/30267199480.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/44743423305.pdfIn PDF document text
    • http://dezis.ru/uploads/files/jisafafikatogi.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/40205176380.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/56906347609.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210918180714.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/wabivizisukuzonupigipaw.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/lebaxuwili.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/nipulenafurubegi.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/15960782635.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/58011938660.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/43541570775.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/69140431712.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/mikikuruparemex.pdfIn PDF document text
    • http://chamdure.com/DATA/files/50801240255.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210906192411.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/82802309890.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/bamagepunekilevoxigaji.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/98122447607.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f9209406ca0848f2ad17ddcb81dce5ff/95483793916.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/15924128909.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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 11016 bytes
SHA-256: 44c677789aaed1836a24873969efdc1343f7bb134c28d8bf28caf910964c318e
font_01_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 18172 bytes
SHA-256: 9713e8c43a5bd0bcfee1dbb4429f5613698c0dbc242f44e1657e54d48c025d48

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