Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c099d63d1700d7…

MALICIOUS

PDF

90.5 KB Created: 2021-03-12 19:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ce4e133cbaf37433af8529567679d5 SHA-1: 4444896ca74a510dab8d161b3e785d7dbbd15a85 SHA-256: e8c099d63d1700d7c5da34fadfd8cd50741a26273177965afe1dec6d32fd4c0d
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 a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dafemum.ru/wix?keyword=beyond+opinion+ravi+zacharias+pdf
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/dawiketuda.pdf
    • https://walikuroxora.weebly.com/uploads/1/3/2/8/132815001/bb940fc7c2.pdf
    • https://cdn.sqhk.co/nolovojawek/EbjaDhf/dash_questionnaire_reliability_and_validity.pdf
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/6113438.pdf
    • https://cdn.sqhk.co/xeloxilava/jeJ5jcj/zenomowijadimufoz.pdf
    • https://cdn.sqhk.co/gupuwiwi/fQy6hf6/26420870563.pdf
    • https://josaboduzez.weebly.com/uploads/1/3/1/6/131637311/japej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_3a958cfd20194e96b54bc0f9c7dcbbc3.pdf?index=true
    • https://s3.amazonaws.com/xidulumexi/arabinose_function_in_transformation.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_a4a5a749b521438582f56763c08f56fe.pdf?index=true
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_5105ca0bf2ee4d0fbaf91fecaacdcd11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af1a388f-17af-4246-b61e-2f8fcd05d17c/varig.pdf
    • https://s3.amazonaws.com/poguvelefa/radiation_protection_in_medical_radiography_answers.pdf
    • https://s3.amazonaws.com/jaxesabi/gegob.pdf
    • https://s3.amazonaws.com/mejados/60640673035.pdf
    • https://uploads.strikinglycdn.com/files/189d9646-94a6-48ca-a117-4460aa27cdd9/the_giver_questions_chapter_21-23.pdf
    • https://s3.amazonaws.com/fizufapu/the_other_side_of_midnight_film_wiki.pdf
    • https://s3.amazonaws.com/samopakamefap/ribaxuw.pdf
    • https://s3.amazonaws.com/bejeseja/14547832109.pdf
    • https://uploads.strikinglycdn.com/files/e6547949-1962-418c-b173-c161ac292f5a/the_language_of_composition_chapter_1.pdf
    • https://s3.amazonaws.com/begijufadi/63114105086.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_0e667f73f46d49d1a46d623c9ddcebf6.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5b8ae63a1e494e17afb49628a4c1ba8f.pdf?index=true
    • https://s3.amazonaws.com/begijufadi/errterung_schreiben_beispiel.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001112a.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 6744 bytes
font_01_sfnt_off00012211.bin
37d55f02e8a8ec4df257b4c42715946dcd787ee0f962a1c890f3b9cf2c127944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 5472 bytes
font_02_sfnt_off000134c6.bin
ff752c8dfc349314717521350c8bfad19b47d1559d48b53bd45c5f0d84454ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 10920 bytes

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