Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ae54f58837caab…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 23:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea424e59f78c496f776d5800f54ffa4c SHA-1: 25a29570aed22ea600acb0d81b150348eede29f6 SHA-256: c5ae54f58837caab67aec144ace126ec2f1d52728cb3cff6b921245b01db831e
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thueotodn.com/uploads/image/files/5641949664.pdf In PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/16998565620.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fefudodowoxer.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/tufufunigoxonafozojevuv.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/bonubisewomigigowuxog.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904010443.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/dujikelusubegol.pdfIn PDF document text
    • http://carbontuning.ru/file/66423305310.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/98515e6316253e4e223a9eca4872f076/33084405393.pdfIn PDF document text
    • https://buyafranchise.org/files/files/rukaluvelutog.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/60447076988.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/bakajakuzejutavako.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/20825210380.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/94513419589.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/65299119185.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/faxizufawesevuzoripepa.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/62211163980.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/vijeretemegunezolij.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/19709109308.pdfIn PDF document text
    • http://lblussana.it/images/file/pegosazuwazogebex.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/kaxovexakapu.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/21746807490.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/73082051136.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tugilomuzegen.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0f78793c---samenetarinofuxitenesigov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=margaret+atwood+survival+pdfPDF 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_off0000b9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 16288 bytes
SHA-256: 4b680be3d12e14fdd79fd8ec841e61f6789b4561e4c25cb811891990c70a50dc
font_01_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10816 bytes
SHA-256: 01092c775465d753384fd3ae27e76abb05a662ad852863204c61a0a534f9c7ef

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