Malicious PDF — malware analysis report

Static analysis result for SHA-256 907627d39a2331e0…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 09:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d1f41fc787793c7c697754e4049bbe4 SHA-1: f70c92e9534bc8b1b00eaac8c823661936d258e1 SHA-256: 907627d39a2331e009ab946695876874794175e521aab12a491040056d75b9d7
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 malicious intent. It contains numerous embedded URLs, with one specifically targeting 'fake real credit card numbers', suggesting a phishing or scam lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=fake+real+credit+card+numbers PDF link annotation
    • http://asbu.net/uploads/FCK_files/file/mevamidetilapufoduzow.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/64768716387.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/temojuf.pdfIn PDF document text
    • https://ferropula.hr/files/mewigiv.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/zavoxokofasad.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/51842365183.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/49156222894.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/mujavigud.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/vovovigixepemawifukipilo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/448696e9e19d431d6ef16ae1560f7e04/46199633414.pdfIn PDF document text
    • https://sergiomauri.com/images/file/14143411349.pdfIn PDF document text
    • http://benrassam.com/uploads/files/lowuvisowusofisexerir.pdfIn PDF document text
    • http://sushi-belovo.ru/files/wanewigibelowi.pdfIn PDF document text
    • http://ahchala.com/img/file/nonuwepilominubaxi.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109041756393412.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/tosuwezonufedovipiwogep.pdfIn PDF document text
    • http://vecsecity.info/editor_up/todopegumaxexivapopixexe.pdfIn PDF document text
    • https://alev.az/userfiles/file/sodafupagewapafumikewim.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/42093968100.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/66873324536.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/17473089071.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/luketajodedixovigewemagaw.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210923_9B4343F93F379529.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_off0000ad1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 10720 bytes
SHA-256: 6200e94f2df273031097db70ac6243456e488249391f20b0b67ac930f1bd3bbb
font_02_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 14556 bytes
SHA-256: 4c1c47a02d5bb296aa14375d2b42a11cef7282cfbe23bbe0418bde40a001a63b

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