Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c226b0c8647f54…

MALICIOUS

PDF

70.3 KB Created: 2020-11-17 07:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab459fe0971cde859c9438fb12ee4d47 SHA-1: d1d7b5fcf564fe6f803fc8fb219c1e156e96b1e8 SHA-256: f5c226b0c8647f543dbbf2aec5bab29d68dde5f7d0bffe17283d8516bfe96832
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL pointing to a suspicious domain, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=new+york+state+social+security+office+syracuse+ny
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/8750552.pdf
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5fa02193ebc80.pdf
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/lebugodoj_xufadijemorov_davubesezon_koravisawonub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6f59c309-2969-4e5a-90c8-63674b0131a5/pathfinder_anti_paladin_guide.pdf
    • https://uploads.strikinglycdn.com/files/ff7fdd50-41a3-437d-92e9-de77b4fda229/bekus.pdf
    • https://s3.amazonaws.com/gozifep/should_this_dog_be_called_spot_answers.pdf
    • https://uploads.strikinglycdn.com/files/c479dde4-0d2d-4c16-8a59-3787dd5a7c46/15876475795.pdf
    • https://uploads.strikinglycdn.com/files/bd7b00d0-6d7c-44d7-a8ac-70d3f5724d67/bishop_guertin_high_school.pdf
    • https://uploads.strikinglycdn.com/files/e804d115-e4c5-448f-a54c-28e863a27ebd/o_valor_de_certo_equipamento_comprado_por_60000.pdf
    • https://uploads.strikinglycdn.com/files/e30e62a4-7213-43f7-ac56-ae4f207843b8/46248217380.pdf
    • https://s3.amazonaws.com/kudefem/allergy_to_silicon_dioxide.pdf
    • https://uploads.strikinglycdn.com/files/912f5264-68bb-42ab-ab5d-fcec93d8e890/vevif.pdf
    • https://s3.amazonaws.com/sugaguxagu/fekajefaverugazetasa.pdf
    • https://s3.amazonaws.com/nilititonawafim/jewel_monopoly_2020_when_does_it_end.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c854.bin
1ff90539e6c960e203dee7a6abc544536b4c5da561f856d6a1fa76141a06fc2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 4984 bytes
font_01_sfnt_off0000d976.bin
ec91e2d129ed67f0d0633a48696729de16b33b0f3be568cbd6026291ddad4451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 10772 bytes
font_02_sfnt_off0000fdd0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 4324 bytes

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