Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0276e85fb3f2d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 03:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c7c36fc2d8bc570932e03399a100408 SHA-1: 61e432a66a6fd0a9194e23803a0dd104f4186796 SHA-256: 87c0276e85fb3f2d87f3d3153e749d313416d6010ce23c1c5c5be0e83832c612
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on various domains. The `utm_term_redirector=True` finding suggests a phishing or traffic-driving intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.lircai.com/web/inline/file/91463097433.pdf In PDF document text
    • http://liveranigioielli.it/userfiles/files/79163033659.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/retozuwukes.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_66018E2605FB2F1D.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b764de6795---72265293475.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/nixefe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d43f7ea4a---3460499505.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/jodozilov.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/56354100602.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/79223136731.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/16293368646.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/4830657841.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414dcfaa9a8---wibanuvudigudin.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/vovakeno.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/83977563623.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/25595642795.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/pageguwija.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/71098947217.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/modezabozisalakewaruvixo.pdfIn PDF document text
    • http://nature-revive.org/files/file/natejirusanemani.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902223307.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/gerefanutepuxawure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=add+screenshot+shortcut+androidPDF 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_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 10500 bytes
SHA-256: fa7ca6fdaf899d40f7854c2fa9a0aeb0fb77784663e62800b68c1c7ed5178e56
font_02_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 18156 bytes
SHA-256: 28c4c50040c5ee663f69bfb65445e7bb34d60c4fda15d8ea0ae542e589b09a14

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