Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa3c08075f9d4a6…

MALICIOUS

PDF

83.4 KB Created: 2021-01-08 14:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c531f9e5cce8300b20fdb5f31844243a SHA-1: f5024e03ae9036c6a17446c2b48758b9ebdd673a SHA-256: dfa3c08075f9d4a6733be4c6bb01791cf6daa24b92597b956e608f9cf155d9c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including one to 'traffnew.ru', which is flagged as suspicious. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent, likely to trick users into downloading further malware. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=chrome+os+for+windows+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5fa73a0346256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5f9f113318c8b.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/2ff32df3daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f8eabfb3aee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453890/normal_5fcf5a5052bc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372982/normal_5fed3b152a441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/written_off_account_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/bangla_dictionary_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/aura_kingdom_lancer_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/98968871554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ebfc7c-545a-46c9-b4c0-d830d23f8ad5/10854500513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b0a606-2f14-4546-afef-d90a229ae49c/transylvania_6_5000_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22188796-f8d6-4b6b-b703-2d17eeb7cae4/vujubatevegakasaramon.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://scripts.sil.org/OFLIn 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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 5152 bytes
SHA-256: 47c6b7e49efd8612357cdf89841d0d3aa7751f22832af428b3be05c21ecc9ccb
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 11936 bytes
SHA-256: 98eb97cce118e049ed397a49a0a057c3ab9611f2ba383c1bbb600923721eae24
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16616 bytes
SHA-256: 242a26218cd80b00468f8b0c3498fd48bc6360f5609f724cf96e6ccf83c42aee

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