Malicious PDF — malware analysis report

Static analysis result for SHA-256 003bf519fb3e39e9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-26 05:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04ef5d37665b9b6b188cb370e88e6e8e SHA-1: 8af792968d3087b5b0977a8478959cd22f218ff9 SHA-256: 003bf519fb3e39e9b2b3bd42f36623cc1c98f027d2adc5f08b21a43732098c41
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to construction and maintenance engineering books, likely to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://jottigo.ru/award?keyword=building+construction+and+maintenance+engineering+book+pdf PDF link annotation
    • https://cdn.sqhk.co/mogudekusab/jheyghI/pipaxapalowozi.pdfIn PDF document text
    • http://gusimaziwagax.22web.org/ibm_blockchain_platform_documentation.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/fevujisuxidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_601a2f29a886b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5ff945cc5e8d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_5ff81ddf4292f.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/jjjcjhg/lusudezexitixiwijov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_1923ab036cdb4ff2ae84443dd6fdcc2a.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_471346ed432043cc84172c31dce3efca.pdf?index=trueIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_35d1c835485d4db18131bfc5ae8266c2.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_7e3349f566f344babe79be2f593f4703.pdf?index=trueIn PDF document text
    • http://zixufiwama.rf.gd/crib_sheet_sets_bulk.pdfIn PDF document text
    • http://gowamatul.epizy.com/xemusobowejadekipigibove.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_d06166b94ae04d0fb3a8429e370947f5.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_79dc027975db4447abb6b64a7ff50b47.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_c2d9cd9609f241b09abedfc457afeb23.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_deadd1016c6e41169d978f208b1ad251.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_89a4c0d72dca47988126c846a650ad3f.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_84c125dd172f41e7a49ae912d142e601.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_2b00f0e5a0e84eaa97f5e02214955bcb.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_f53326c38bf046c6935f68f4a43b52ea.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_07d0221f736847c5af3d4fc12139889f.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 5728 bytes
SHA-256: eec7c880f81b21d3dbf210fc6cfca2b6cf9757b6685771c374fa9adfe16c5d8e
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 10492 bytes
SHA-256: cdb57852cf1c9a1741e202e76d78782258c509b535e9acc97299706f845206e7

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