Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a55fe7b1206e07…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 00:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3910ff5f819cffd75903184c744af45 SHA-1: 9f531dbceb9e249663adb4379129db91fc532f9e SHA-256: e6a55fe7b1206e07ebf0c9d8c9add4f85e5f5fd703f9bd8e7bd003067f82bab5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=unturned+metal+placard PDF link annotation
    • http://boschvietnam.vn/files/usersfiles/files/fawulikunexe.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/megiguwobawuguzu.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/47009666598.pdfIn PDF document text
    • https://tipresentoio.it/images/file/soragame.pdfIn PDF document text
    • http://cx-gl.hu/images/files/xivumamutalilelav.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/4231399313.pdfIn PDF document text
    • http://perksys.com/userfiles/file/75069093853.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/49840664451.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/tubokovakaretaluxe.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/xokixosawij.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/tikubidupumotekoxisorurow.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/jexuletenemovulivevoliji.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/kukezed.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631819611.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/58225987578.pdfIn PDF document text
    • http://ave-france.com/pics/files/98346883530.pdfIn PDF document text
    • https://businesslife.com/content/file/nafulapiwovoju.pdfIn PDF document text
    • https://sapporopools.com/contents/files/fimivuko.pdfIn PDF document text
    • http://iknow.pl/files/file/gumexolo.pdfIn PDF document text
    • http://trieuduong.com/images/Download/41642994477.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/36015719256.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/29019308238.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/67653244205.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/45476912883.pdfIn PDF document text
    • https://steamcomIn 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10404 bytes
SHA-256: 327138f9cce6897c9ea7ea6ec2e905c63fc3d40f513558950571b05c731157ec
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 17376 bytes
SHA-256: 65540e7187ea9f262b6cb7baea139b6ef48124d25a0bfe00712bab0c81b5d4ed

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