Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c8386b88c7d944…

MALICIOUS

PDF

82.2 KB Created: 2021-03-29 16:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfc27c5313b897cadcc2cfd4f0781ff5 SHA-1: affd1476a15351f526d1c9be9d0054e8580329fd SHA-256: e3c8386b88c7d944692f397390a76f29505d5794212f995c819a28e265965f17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/wix?keyword=billy+joel+miller+park
    • https://vadizomozizi.weebly.com/uploads/1/3/5/4/135400682/acd9e2cea503c87.pdf
    • https://cdn-cms.f-static.net/uploads/4383924/normal_60571fe8c6e11.pdf
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5ff3e1824c274.pdf
    • https://cdn-cms.f-static.net/uploads/4417824/normal_602df7f55d5c9.pdf
    • https://static.s123-cdn-static.com/uploads/4474222/normal_6000861ac6651.pdf
    • https://sivabujik.weebly.com/uploads/1/3/4/0/134017760/tazavupu-lugomugekuletu.pdf
    • https://cdn-cms.f-static.net/uploads/4481836/normal_604739a0539ee.pdf
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/5bf6554229a40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/930cac78-0f77-4e53-b8b3-e2c542080881/sword_art_online_characters_yui.pdf
    • https://uploads.strikinglycdn.com/files/7fd1ab13-278d-4ae2-80e2-4fff00424b4e/76981797977.pdf
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_750784b6d8354f71a85b24d7e734d5bb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98418284-c687-45c0-bfd6-318afa822577/xudiletaradodovisud.pdf
    • https://uploads.strikinglycdn.com/files/73461d07-e4dd-442f-95ac-c3da8e74226f/whats_a_metaphor_ks2.pdf
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_ca3bccc15b2e4a0ba9bd1d3793253dc3.pdf?index=true
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_641199da03ae48228b89fc58f56165b2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0a76d1f-b24f-4603-a304-6a7bbe3de4ca/tafutotabidowediji.pdf
    • https://uploads.strikinglycdn.com/files/3e314dd5-585c-4ef0-8ee2-d7b249b8245c/maze_runner_2_free_full_movie_online.pdf
    • https://uploads.strikinglycdn.com/files/f8fee78e-f20a-4704-ada1-1660e4cae634/87143546339.pdf
    • https://uploads.strikinglycdn.com/files/7424a32e-50d7-4952-b9a7-b133c174d123/jenosupazuraxalokomipeb.pdf
    • https://uploads.strikinglycdn.com/files/39381cf2-7131-41c6-889f-cb84a864ef1b/navy_seal_training_reddit.pdf
    • https://uploads.strikinglycdn.com/files/616b6deb-450b-47e9-a307-92bf31e3e49c/lexuzikajek.pdf
    • https://uploads.strikinglycdn.com/files/255b3a01-1734-4697-9b5a-185afee3bb29/derofuwakiritudoxu.pdf
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_c8669311e6ad4f43aea552fdabcbc9eb.pdf?index=true
    • https://df9f6e4b-8d15-4ffc-a22d-a689b54aa2df.filesusr.com/ugd/205ae4_46294fba6a1348d2a86d6dc8685d3443.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010373.bin
601a8caba6e9a3266825c1e5855d7c3712c911262bb56eebf794a5c4a9ded589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 5080 bytes
font_01_sfnt_off000114b2.bin
7ed7a7486b40534225758d86df792bca8cc6f4e3c36ee3e3d487560ea20b43a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 11392 bytes

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