Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c40f2a4045eb34a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 04:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61c1810a6ecc5efd18a8c1873e29f7e0 SHA-1: 9eb0075d8e81523cc87d49f83995287bf7c38ba4 SHA-256: 7c40f2a4045eb34afe989d92daaa971f1a2b555427e613a7dd3e5921444122b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the primary purpose is to redirect the user to potentially malicious external content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=android+tv+live+channels+dvr PDF link annotation
    • http://shoreluxurylimos.com/userfiles/files/45076509479.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xifumuzarajagiposawuw.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/mifodoximal.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-5/20210905025850400520.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/senugoxuwuzememo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613470f524666---35560401347.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/89190528727.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/38327512120.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/6130317568.pdfIn PDF document text
    • http://vkts.se/userfiles/file/90207361546.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/jewatetelubosevavar.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/95289584435.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mulojiro.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/27673509683.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/39012062080.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/taraluromu.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kipenutavazotobupasa.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wujedoparujirusirejegume.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kixod.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/37348350447.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210904_8C0A5AEB038AD942.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/84554591825.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/ziwujidatepaxalanigu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wumigivewelekam.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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 18580 bytes
SHA-256: eecf6c8d4673cb2675d90af689f4d668076069fe652c2ca03d4662ee3a265846
font_02_sfnt_off00013131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 10516 bytes
SHA-256: 82b5bcba95ff15eb12d04d7521e6738dcc66db80b6416e0b8439fe38cb1d96c4

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