Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc5a6c6a4d1a7b6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 11:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f6480990e586df8fabb3eb6dfa4d372b SHA-1: 228bdeda408f173962f5e7f319cd08eb0297dcdf SHA-256: cdc5a6c6a4d1a7b656edcb9fc187580d834aecd0cfc8c76479d9d0e45fd0edd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm with numerous distinct hosts, suggesting a phishing or malware distribution campaign. The embedded URLs, despite one being marked benign, point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://secoinblock.com/upload/files/25752040783.pdf In PDF document text
    • https://juvelyrikoscentras.lt/Files/file/tixojitasurunudivujopo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/wusavikewumusurivibinines.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/55560306873.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a971cd5aa---30026221709.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/9998783237.pdfIn PDF document text
    • http://polkovnik.su/upload/file/32589348890.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84237107832.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/88586906722.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-5/20210905035842773564.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/96029756578.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/mikalazijejabelotewix.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415f9c8066---59989241641.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/latuduratogoju.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/zuzupixokujusonisi.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/53248758789.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/94795374104.pdfIn PDF document text
    • http://partnercable.com/files/jisimufadoteles.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/defuwutakojivatiwisegi.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/28875269283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ota+updater+apkPDF link annotation
    • 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_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 10072 bytes
SHA-256: b9c485c1a69a20129edc5ea04e7c02f36e3c090d16357da8abd2b998e986be84
font_01_sfnt_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 19240 bytes
SHA-256: 6d9866f87c0f5c1cbf4e764fe3b07d0f162aaf20af6acfa6b905b74526ecbc45

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