Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca124531340736c6…

MALICIOUS

PDF

193.8 KB Created: 2021-09-08 21:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: cf6e13bd034e08f83ef837f03dce607d SHA-1: 3f186068c47b774bb22e8ec35f3a759d2f20f3a8 SHA-256: ca124531340736c602e577d6ef8bd37685253a0f556b1e9f47ad145e9056a214
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file that exhibits characteristics of a phishing lure, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and numerous embedded URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to download further malicious content, likely a secondary payload, via a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.profiemg.cz/upload/ck/files/72799850145.pdf In PDF document text
    • http://metallpress.ru/files/48100054196.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/63568277913.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/65924938308.pdfIn PDF document text
    • http://tempatpasang.com/contents/files/badigoxoxotidewufosesefe.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/datuwel.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/55209927168.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/kasug.pdfPDF link annotation
    • http://chono.mn/uploads/userfiles/files/7706372512.pdfIn PDF document text
    • http://airfa.it/userfiles/file/jurase.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161385e9d3eec5---sapedomul.pdfIn PDF document text
    • http://hotechike.com/files/files/27882308875.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/84034518625.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/gutofidokewuwa.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/bogafelolarilozej.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c55ce98b9---xoxixabevi.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/72667048474.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/48642699264.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/72108415347.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16134f80e84f0c---76514150470.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/82923876441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=boots+of+winterlands+5ePDF 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_off00029617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29617 10620 bytes
SHA-256: efeadc77a24fa5b98b949c26381cd47eea1aad39d80f1dcb2a847cabf705b780
font_01_sfnt_off0002aea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6B7 19424 bytes
SHA-256: 45c6f76a9d7cdea03b417412f149f332998e6e5a722a5a796f50f8fce78410e3

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